coccinelle: Remove unnecessary variables for function return value

Use Coccinelle script to replace 'ret = E; return ret' with
'return E'. The script will do the substitution only when the
function return type and variable type are the same.

Manual fixups:

* audio/audio.c: coding style of "read (...)" and "write (...)"
* block/qcow2-cluster.c: wrap line to make it shorter
* block/qcow2-refcount.c: change indentation of wrapped line
* target-tricore/op_helper.c: fix coding style of
  "remainder|quotient"
* target-mips/dsp_helper.c: reverted changes because I don't
  want to argue about checkpatch.pl
* ui/qemu-pixman.c: fix line indentation
* block/rbd.c: restore blank line between declarations and
  statements

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1465855078-19435-4-git-send-email-ehabkost@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Unused Coccinelle rule name dropped along with a redundant comment;
whitespace touched up in block/qcow2-cluster.c; stale commit message
paragraph deleted]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

audio/audio.c

@@ -1131,8 +1131,6 @@ static void audio_timer (void *opaque)
  */
 int AUD_write (SWVoiceOut *sw, void *buf, int size)
 {
-    int bytes;
-
     if (!sw) {
         /* XXX: Consider options */
         return size;
@@ -1143,14 +1141,11 @@ int AUD_write (SWVoiceOut *sw, void *buf, int size)
         return 0;
     }
 
-    bytes = sw->hw->pcm_ops->write (sw, buf, size);
-    return bytes;
+    return sw->hw->pcm_ops->write(sw, buf, size);
 }
 
 int AUD_read (SWVoiceIn *sw, void *buf, int size)
 {
-    int bytes;
-
     if (!sw) {
         /* XXX: Consider options */
         return size;
@@ -1161,8 +1156,7 @@ int AUD_read (SWVoiceIn *sw, void *buf, int size)
         return 0;
     }
 
-    bytes = sw->hw->pcm_ops->read (sw, buf, size);
-    return bytes;
+    return sw->hw->pcm_ops->read(sw, buf, size);
 }
 
 int AUD_get_buffer_size_out (SWVoiceOut *sw)

block/archipelago.c

@@ -974,11 +974,9 @@ err_exit2:
 
 static int64_t qemu_archipelago_getlength(BlockDriverState *bs)
 {
-    int64_t ret;
     BDRVArchipelagoState *s = bs->opaque;
 
-    ret = archipelago_volume_info(s);
-    return ret;
+    return archipelago_volume_info(s);
 }
 
 static int qemu_archipelago_truncate(BlockDriverState *bs, int64_t offset)

block/qcow2-cluster.c

@@ -154,11 +154,9 @@ static int l2_load(BlockDriverState *bs, uint64_t l2_offset,
     uint64_t **l2_table)
 {
     BDRVQcow2State *s = bs->opaque;
-    int ret;
 
-    ret = qcow2_cache_get(bs, s->l2_table_cache, l2_offset, (void**) l2_table);
-
-    return ret;
+    return qcow2_cache_get(bs, s->l2_table_cache, l2_offset,
+                           (void **)l2_table);
 }
 
 /*

block/qcow2-refcount.c

@@ -218,13 +218,10 @@ static int load_refcount_block(BlockDriverState *bs,
                                void **refcount_block)
 {
     BDRVQcow2State *s = bs->opaque;
-    int ret;
 
     BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_LOAD);
-    ret = qcow2_cache_get(bs, s->refcount_block_cache, refcount_block_offset,
-        refcount_block);
-
-    return ret;
+    return qcow2_cache_get(bs, s->refcount_block_cache, refcount_block_offset,
+                           refcount_block);
 }
 
 /*

block/raw-posix.c

@@ -582,11 +582,9 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
                     Error **errp)
 {
     BDRVRawState *s = bs->opaque;
-    int ret;
 
     s->type = FTYPE_FILE;
-    ret = raw_open_common(bs, options, flags, 0, errp);
-    return ret;
+    return raw_open_common(bs, options, flags, 0, errp);
 }
 
 static int raw_reopen_prepare(BDRVReopenState *state,
@@ -2437,13 +2435,11 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
                       Error **errp)
 {
     BDRVRawState *s = bs->opaque;
-    int ret;
 
     s->type = FTYPE_CD;
 
     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
-    ret = raw_open_common(bs, options, flags, O_NONBLOCK, errp);
-    return ret;
+    return raw_open_common(bs, options, flags, O_NONBLOCK, errp);
 }
 
 static int cdrom_probe_device(const char *filename)

block/raw_bsd.c

@@ -190,10 +190,7 @@ static int raw_has_zero_init(BlockDriverState *bs)
 
 static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
 {
-    int ret;
-
-    ret = bdrv_create_file(filename, opts, errp);
-    return ret;
+    return bdrv_create_file(filename, opts, errp);
 }
 
 static int raw_open(BlockDriverState *bs, QDict *options, int flags,

block/rbd.c

@@ -883,10 +883,8 @@ static int qemu_rbd_snap_rollback(BlockDriverState *bs,
                                   const char *snapshot_name)
 {
     BDRVRBDState *s = bs->opaque;
-    int r;
 
-    r = rbd_snap_rollback(s->image, snapshot_name);
-    return r;
+    return rbd_snap_rollback(s->image, snapshot_name);
 }
 
 static int qemu_rbd_snap_list(BlockDriverState *bs,

block/vmdk.c

@@ -1260,15 +1260,13 @@ static VmdkExtent *find_extent(BDRVVmdkState *s,
 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
                                                    int64_t offset)
 {
-    uint64_t offset_in_cluster, extent_begin_offset, extent_relative_offset;
+    uint64_t extent_begin_offset, extent_relative_offset;
     uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
 
     extent_begin_offset =
         (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
     extent_relative_offset = offset - extent_begin_offset;
-    offset_in_cluster = extent_relative_offset % cluster_size;
-
-    return offset_in_cluster;
+    return extent_relative_offset % cluster_size;
 }
 
 static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent,

block/vvfat.c

@@ -114,15 +114,12 @@ static inline int array_ensure_allocated(array_t* array, int index)
 
 static inline void* array_get_next(array_t* array) {
     unsigned int next = array->next;
-    void* result;
 
     if (array_ensure_allocated(array, next) < 0)
 	return NULL;
 
     array->next = next + 1;
-    result = array_get(array, next);
-
-    return result;
+    return array_get(array, next);
 }
 
 static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {

hw/acpi/aml-build.c

@@ -324,12 +324,9 @@ static void aml_free(gpointer data, gpointer user_data)
 
 Aml *init_aml_allocator(void)
 {
-    Aml *var;
-
     assert(!alloc_list);
     alloc_list = g_ptr_array_new();
-    var = aml_alloc();
-    return var;
+    return aml_alloc();
 }
 
 void free_aml_allocator(void)
@@ -451,12 +448,10 @@ Aml *aml_name_decl(const char *name, Aml *val)
 /* ACPI 1.0b: 16.2.6.1 Arg Objects Encoding */
 Aml *aml_arg(int pos)
 {
-    Aml *var;
     uint8_t op = 0x68 /* ARG0 op */ + pos;
 
     assert(pos <= 6);
-    var = aml_opcode(op);
-    return var;
+    return aml_opcode(op);
 }
 
 /* ACPI 2.0a: 17.2.4.4 Type 2 Opcodes Encoding: DefToInteger */
@@ -1082,12 +1077,10 @@ Aml *aml_string(const char *name_format, ...)
 /* ACPI 1.0b: 16.2.6.2 Local Objects Encoding */
 Aml *aml_local(int num)
 {
-    Aml *var;
     uint8_t op = 0x60 /* Local0Op */ + num;
 
     assert(num <= 7);
-    var = aml_opcode(op);
-    return var;
+    return aml_opcode(op);
 }
 
 /* ACPI 2.0a: 17.2.2 Data Objects Encoding: DefVarPackage */

hw/audio/intel-hda.c

@@ -219,10 +219,7 @@ static void intel_hda_reset(DeviceState *dev);
 
 static hwaddr intel_hda_addr(uint32_t lbase, uint32_t ubase)
 {
-    hwaddr addr;
-
-    addr = ((uint64_t)ubase << 32) | lbase;
-    return addr;
+    return ((uint64_t)ubase << 32) | lbase;
 }
 
 static void intel_hda_update_int_sts(IntelHDAState *d)

hw/display/vga.c

@@ -700,9 +700,7 @@ static void vbe_update_vgaregs(VGACommonState *s)
 static uint32_t vbe_ioport_read_index(void *opaque, uint32_t addr)
 {
     VGACommonState *s = opaque;
-    uint32_t val;
-    val = s->vbe_index;
-    return val;
+    return s->vbe_index;
 }
 
 uint32_t vbe_ioport_read_data(void *opaque, uint32_t addr)

hw/intc/s390_flic_kvm.c

@@ -195,7 +195,7 @@ static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
         .swap = swap,
     };
     KVMS390FLICState *flic = KVM_S390_FLIC(fs);
-    int r, ret;
+    int r;
     struct kvm_device_attr attr = {
         .group = KVM_DEV_FLIC_ADAPTER_REGISTER,
         .addr = (uint64_t)&adapter,
@@ -208,8 +208,7 @@ static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
 
     r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
 
-    ret = r ? -errno : 0;
-    return ret;
+    return r ? -errno : 0;
 }
 
 static int kvm_s390_io_adapter_map(S390FLICState *fs, uint32_t id,

hw/pci-host/uninorth.c

@@ -62,12 +62,9 @@ typedef struct UNINState {
 
 static int pci_unin_map_irq(PCIDevice *pci_dev, int irq_num)
 {
-    int retval;
     int devfn = pci_dev->devfn & 0x00FFFFFF;
 
-    retval = (((devfn >> 11) & 0x1F) + irq_num) & 3;
-
-    return retval;
+    return (((devfn >> 11) & 0x1F) + irq_num) & 3;
 }
 
 static void pci_unin_set_irq(void *opaque, int irq_num, int level)

hw/ppc/spapr_vio.c

@@ -57,12 +57,9 @@ static char *spapr_vio_get_dev_name(DeviceState *qdev)
 {
     VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
     VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
-    char *name;
 
     /* Device tree style name device@reg */
-    name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
-
-    return name;
+    return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
 }
 
 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)

hw/scsi/megasas.c

@@ -410,17 +410,14 @@ static void megasas_encode_lba(uint8_t *cdb, uint64_t lba,
 static uint64_t megasas_fw_time(void)
 {
     struct tm curtime;
-    uint64_t bcd_time;
 
     qemu_get_timedate(&curtime, 0);
-    bcd_time = ((uint64_t)curtime.tm_sec & 0xff) << 48 |
+    return ((uint64_t)curtime.tm_sec & 0xff) << 48 |
         ((uint64_t)curtime.tm_min & 0xff)  << 40 |
         ((uint64_t)curtime.tm_hour & 0xff) << 32 |
         ((uint64_t)curtime.tm_mday & 0xff) << 24 |
         ((uint64_t)curtime.tm_mon & 0xff)  << 16 |
         ((uint64_t)(curtime.tm_year + 1900) & 0xffff);
-
-    return bcd_time;
 }
 
 /*

hw/scsi/scsi-generic.c

@@ -579,10 +579,7 @@ const SCSIReqOps scsi_generic_req_ops = {
 static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
                                      uint8_t *buf, void *hba_private)
 {
-    SCSIRequest *req;
-
-    req = scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
-    return req;
+    return scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
 }
 
 static Property scsi_generic_properties[] = {

hw/timer/mc146818rtc.c

@@ -105,12 +105,10 @@ static inline bool rtc_running(RTCState *s)
 
 static uint64_t get_guest_rtc_ns(RTCState *s)
 {
-    uint64_t guest_rtc;
     uint64_t guest_clock = qemu_clock_get_ns(rtc_clock);
 
-    guest_rtc = s->base_rtc * NANOSECONDS_PER_SECOND +
+    return s->base_rtc * NANOSECONDS_PER_SECOND +
         guest_clock - s->last_update + s->offset;
-    return guest_rtc;
 }
 
 #ifdef TARGET_I386

hw/virtio/virtio-pci.c

@@ -761,9 +761,7 @@ static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
-    int ret;
-    ret = kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
-    return ret;
+    return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
 }
 
 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,

linux-user/signal.c

@@ -195,7 +195,6 @@ int block_signals(void)
 {
     TaskState *ts = (TaskState *)thread_cpu->opaque;
     sigset_t set;
-    int pending;
 
     /* It's OK to block everything including SIGSEGV, because we won't
      * run any further guest code before unblocking signals in
@@ -204,9 +203,7 @@ int block_signals(void)
     sigfillset(&set);
     sigprocmask(SIG_SETMASK, &set, 0);
 
-    pending = atomic_xchg(&ts->signal_pending, 1);
-
-    return pending;
+    return atomic_xchg(&ts->signal_pending, 1);
 }
 
 /* Wrapper for sigprocmask function
@@ -3956,9 +3953,7 @@ static void setup_sigcontext(struct target_sigcontext *sc,
 
 static inline unsigned long align_sigframe(unsigned long sp)
 {
-    unsigned long i;
-    i = sp & ~3UL;
-    return i;
+    return sp & ~3UL;
 }
 
 static inline abi_ulong get_sigframe(struct target_sigaction *ka,
@@ -4555,7 +4550,7 @@ static target_ulong get_sigframe(struct target_sigaction *ka,
                                  CPUPPCState *env,
                                  int frame_size)
 {
-    target_ulong oldsp, newsp;
+    target_ulong oldsp;
 
     oldsp = env->gpr[1];
 
@@ -4565,9 +4560,7 @@ static target_ulong get_sigframe(struct target_sigaction *ka,
                  + target_sigaltstack_used.ss_size);
     }
 
-    newsp = (oldsp - frame_size) & ~0xFUL;
-
-    return newsp;
+    return (oldsp - frame_size) & ~0xFUL;
 }
 
 static void save_user_regs(CPUPPCState *env, struct target_mcontext *frame)

page_cache.c

@@ -111,11 +111,8 @@ void cache_fini(PageCache *cache)
 static size_t cache_get_cache_pos(const PageCache *cache,
                                   uint64_t address)
 {
-    size_t pos;
-
     g_assert(cache->max_num_items);
-    pos = (address / cache->page_size) & (cache->max_num_items - 1);
-    return pos;
+    return (address / cache->page_size) & (cache->max_num_items - 1);
 }
 
 static CacheItem *cache_get_by_addr(const PageCache *cache, uint64_t addr)

qga/commands-posix.c

@@ -127,7 +127,6 @@ int64_t qmp_guest_get_time(Error **errp)
 {
    int ret;
    qemu_timeval tq;
-   int64_t time_ns;
 
    ret = qemu_gettimeofday(&tq);
    if (ret < 0) {
@@ -135,8 +134,7 @@ int64_t qmp_guest_get_time(Error **errp)
        return -1;
    }
 
-   time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
-   return time_ns;
+   return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
 }
 
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)

qga/commands-win32.c

@@ -1150,7 +1150,6 @@ out:
 int64_t qmp_guest_get_time(Error **errp)
 {
     SYSTEMTIME ts = {0};
-    int64_t time_ns;
     FILETIME tf;
 
     GetSystemTime(&ts);
@@ -1164,10 +1163,8 @@ int64_t qmp_guest_get_time(Error **errp)
         return -1;
     }
 
-    time_ns = ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
+    return ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
                 - W32_FT_OFFSET) * 100;
-
-    return time_ns;
 }
 
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)

qobject/qlist.c

@@ -100,7 +100,6 @@ QObject *qlist_pop(QList *qlist)
 QObject *qlist_peek(QList *qlist)
 {
     QListEntry *entry;
-    QObject *ret;
 
     if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
         return NULL;
@@ -108,9 +107,7 @@ QObject *qlist_peek(QList *qlist)
 
     entry = QTAILQ_FIRST(&qlist->head);
 
-    ret = entry->value;
-
-    return ret;
+    return entry->value;
 }
 
 int qlist_empty(const QList *qlist)

scripts/coccinelle/return_directly.cocci

@@ -0,0 +1,19 @@
+// replace 'R = X; return R;' with 'return R;'
+@@
+identifier VAR;
+expression E;
+type T;
+identifier F;
+@@
+ T F(...)
+ {
+     ...
+-    T VAR;
+     ... when != VAR
+
+-    VAR =
++    return
+     E;
+-    return VAR;
+     ... when != VAR
+ }

target-i386/fpu_helper.c

@@ -298,18 +298,12 @@ int32_t helper_fistt_ST0(CPUX86State *env)
 
 int32_t helper_fisttl_ST0(CPUX86State *env)
 {
-    int32_t val;
-
-    val = floatx80_to_int32_round_to_zero(ST0, &env->fp_status);
-    return val;
+    return floatx80_to_int32_round_to_zero(ST0, &env->fp_status);
 }
 
 int64_t helper_fisttll_ST0(CPUX86State *env)
 {
-    int64_t val;
-
-    val = floatx80_to_int64_round_to_zero(ST0, &env->fp_status);
-    return val;
+    return floatx80_to_int64_round_to_zero(ST0, &env->fp_status);
 }
 
 void helper_fldt_ST0(CPUX86State *env, target_ulong ptr)

target-i386/kvm.c

@@ -1346,7 +1346,7 @@ static int kvm_put_xsave(X86CPU *cpu)
     CPUX86State *env = &cpu->env;
     X86XSaveArea *xsave = env->kvm_xsave_buf;
     uint16_t cwd, swd, twd;
-    int i, r;
+    int i;
 
     if (!has_xsave) {
         return kvm_put_fpu(cpu);
@@ -1395,8 +1395,7 @@ static int kvm_put_xsave(X86CPU *cpu)
             16 * sizeof env->xmm_regs[16]);
     memcpy(&xsave->pkru_state, &env->pkru, sizeof env->pkru);
 #endif
-    r = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
-    return r;
+    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
 }
 
 static int kvm_put_xcrs(X86CPU *cpu)

target-mips/op_helper.c

@@ -133,10 +133,8 @@ static inline uint64_t get_HILO(CPUMIPSState *env)
 
 static inline target_ulong set_HIT0_LO(CPUMIPSState *env, uint64_t HILO)
 {
-    target_ulong tmp;
     env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);
-    tmp = env->active_tc.HI[0] = (int32_t)(HILO >> 32);
-    return tmp;
+    return env->active_tc.HI[0] = (int32_t)(HILO >> 32);
 }
 
 static inline target_ulong set_HI_LOT0(CPUMIPSState *env, uint64_t HILO)

target-s390x/helper.c

@@ -70,11 +70,7 @@ void s390x_cpu_timer(void *opaque)
 
 S390CPU *cpu_s390x_create(const char *cpu_model, Error **errp)
 {
-    S390CPU *cpu;
-
-    cpu = S390_CPU(object_new(TYPE_S390_CPU));
-
-    return cpu;
+    return S390_CPU(object_new(TYPE_S390_CPU));
 }
 
 S390CPU *s390x_new_cpu(const char *cpu_model, int64_t id, Error **errp)

target-sparc/cc_helper.c

@@ -200,10 +200,7 @@ static uint32_t compute_all_addx_xcc(CPUSPARCState *env)
 
 static uint32_t compute_C_addx_xcc(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
 }
 #endif
 
@@ -219,10 +216,7 @@ static uint32_t compute_all_addx(CPUSPARCState *env)
 
 static uint32_t compute_C_addx(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
 }
 
 static inline uint32_t get_V_tag_icc(target_ulong src1, target_ulong src2)
@@ -365,10 +359,7 @@ static uint32_t compute_all_subx_xcc(CPUSPARCState *env)
 
 static uint32_t compute_C_subx_xcc(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
 }
 #endif
 
@@ -384,10 +375,7 @@ static uint32_t compute_all_subx(CPUSPARCState *env)
 
 static uint32_t compute_C_subx(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
 }
 
 static uint32_t compute_all_tsub(CPUSPARCState *env)
@@ -479,8 +467,5 @@ void helper_compute_psr(CPUSPARCState *env)
 
 uint32_t helper_compute_C_icc(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = icc_table[CC_OP].compute_c(env) >> PSR_CARRY_SHIFT;
-    return ret;
+    return icc_table[CC_OP].compute_c(env) >> PSR_CARRY_SHIFT;
 }

target-tricore/op_helper.c

@@ -2117,7 +2117,7 @@ uint64_t helper_dvadj(uint64_t r1, uint32_t r2)
     int32_t eq_pos = x_sign & ((r1 >> 32) == r2);
     int32_t eq_neg = x_sign & ((r1 >> 32) == -r2);
     uint32_t quotient;
-    uint64_t ret, remainder;
+    uint64_t remainder;
 
     if ((q_sign & ~eq_neg) | eq_pos) {
         quotient = (r1 + 1) & 0xffffffff;
@@ -2130,8 +2130,7 @@ uint64_t helper_dvadj(uint64_t r1, uint32_t r2)
     } else {
         remainder = (r1 & 0xffffffff00000000ull);
     }
-    ret = remainder|quotient;
-    return ret;
+    return remainder | quotient;
 }
 
 uint64_t helper_dvstep(uint64_t r1, uint32_t r2)
@@ -2236,7 +2235,6 @@ uint64_t helper_divide_u(CPUTriCoreState *env, uint32_t r1, uint32_t r2)
 uint64_t helper_mul_h(uint32_t arg00, uint32_t arg01,
                       uint32_t arg10, uint32_t arg11, uint32_t n)
 {
-    uint64_t ret;
     uint32_t result0, result1;
 
     int32_t sc1 = ((arg00 & 0xffff) == 0x8000) &&
@@ -2253,8 +2251,7 @@ uint64_t helper_mul_h(uint32_t arg00, uint32_t arg01,
     } else {
         result0 = (((uint32_t)(arg01 * arg11)) << n);
     }
-    ret = (((uint64_t)result1 << 32)) | result0;
-    return ret;
+    return (((uint64_t)result1 << 32)) | result0;
 }
 
 uint64_t helper_mulm_h(uint32_t arg00, uint32_t arg01,
@@ -2308,11 +2305,9 @@ uint32_t helper_mulr_h(uint32_t arg00, uint32_t arg01,
 uint32_t helper_crc32(uint32_t arg0, uint32_t arg1)
 {
     uint8_t buf[4];
-    uint32_t ret;
     stl_be_p(buf, arg0);
 
-    ret = crc32(arg1, buf, 4);
-    return ret;
+    return crc32(arg1, buf, 4);
 }
 
 /* context save area (CSA) related helpers */

tests/display-vga-test.c

@@ -50,8 +50,6 @@ static void pci_virtio_vga(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
 
     qtest_add_func("/display/pci/cirrus", pci_cirrus);
@@ -62,7 +60,5 @@ int main(int argc, char **argv)
 #ifdef CONFIG_VIRTIO_VGA
     qtest_add_func("/display/pci/virtio-vga", pci_virtio_vga);
 #endif
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/endianness-test.c

@@ -282,7 +282,6 @@ static void test_endianness_combine(gconstpointer data)
 int main(int argc, char **argv)
 {
     const char *arch = qtest_get_arch();
-    int ret;
     int i;
 
     g_test_init(&argc, &argv, NULL);
@@ -305,7 +304,5 @@ int main(int argc, char **argv)
         qtest_add_data_func(path, &test_cases[i], test_endianness_combine);
     }
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/i440fx-test.c

@@ -394,7 +394,6 @@ static void request_pflash(FirmwareTestFixture *fixture,
 int main(int argc, char **argv)
 {
     TestData data;
-    int ret;
 
     g_test_init(&argc, &argv, NULL);
 
@@ -405,6 +404,5 @@ int main(int argc, char **argv)
     add_firmware_test("i440fx/firmware/bios", request_bios);
     add_firmware_test("i440fx/firmware/pflash", request_pflash);
 
-    ret = g_test_run();
-    return ret;
+    return g_test_run();
 }

tests/intel-hda-test.c

@@ -31,13 +31,9 @@ static void ich9_test(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/intel-hda/ich6", ich6_test);
     qtest_add_func("/intel-hda/ich9", ich9_test);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/test-filter-redirector.c

@@ -209,12 +209,8 @@ static void test_redirector_rx(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/netfilter/redirector_tx", test_redirector_tx);
     qtest_add_func("/netfilter/redirector_rx", test_redirector_rx);
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/virtio-blk-test.c

@@ -763,7 +763,6 @@ static void mmio_basic(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
     const char *arch = qtest_get_arch();
 
     g_test_init(&argc, &argv, NULL);
@@ -779,7 +778,5 @@ int main(int argc, char **argv)
         qtest_add_func("/virtio/blk/mmio/basic", mmio_basic);
     }
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/virtio-console-test.c

@@ -27,13 +27,9 @@ static void serialport_pci_nop(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/virtio/console/pci/nop", console_pci_nop);
     qtest_add_func("/virtio/serialport/pci/nop", serialport_pci_nop);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/virtio-net-test.c

@@ -248,8 +248,6 @@ static void hotplug(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
 #ifndef _WIN32
     qtest_add_data_func("/virtio/net/pci/basic", send_recv_test, pci_basic);
@@ -258,7 +256,5 @@ int main(int argc, char **argv)
 #endif
     qtest_add_func("/virtio/net/pci/hotplug", hotplug);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/virtio-scsi-test.c

@@ -260,15 +260,11 @@ static void test_unaligned_write_same(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/virtio/scsi/pci/nop", pci_nop);
     qtest_add_func("/virtio/scsi/pci/hotplug", hotplug);
     qtest_add_func("/virtio/scsi/pci/scsi-disk/unaligned-write-same",
                    test_unaligned_write_same);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

tests/wdt_ib700-test.c

@@ -117,15 +117,11 @@ static void ib700_none(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/wdt_ib700/pause", ib700_pause);
     qtest_add_func("/wdt_ib700/reset", ib700_reset);
     qtest_add_func("/wdt_ib700/shutdown", ib700_shutdown);
     qtest_add_func("/wdt_ib700/none", ib700_none);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }

ui/cursor.c

@@ -81,18 +81,12 @@ void cursor_print_ascii_art(QEMUCursor *c, const char *prefix)
 
 QEMUCursor *cursor_builtin_hidden(void)
 {
-    QEMUCursor *c;
-
-    c = cursor_parse_xpm(cursor_hidden_xpm);
-    return c;
+    return cursor_parse_xpm(cursor_hidden_xpm);
 }
 
 QEMUCursor *cursor_builtin_left_ptr(void)
 {
-    QEMUCursor *c;
-
-    c = cursor_parse_xpm(cursor_left_ptr_xpm);
-    return c;
+    return cursor_parse_xpm(cursor_left_ptr_xpm);
 }
 
 QEMUCursor *cursor_alloc(int width, int height)

ui/qemu-pixman.c

@@ -180,14 +180,11 @@ void qemu_pixman_linebuf_copy(pixman_image_t *fb, int width, int x, int y,
 pixman_image_t *qemu_pixman_mirror_create(pixman_format_code_t format,
                                           pixman_image_t *image)
 {
-    pixman_image_t *mirror;
-
-    mirror = pixman_image_create_bits(format,
-                                      pixman_image_get_width(image),
-                                      pixman_image_get_height(image),
-                                      NULL,
-                                      pixman_image_get_stride(image));
-    return mirror;
+    return pixman_image_create_bits(format,
+                                    pixman_image_get_width(image),
+                                    pixman_image_get_height(image),
+                                    NULL,
+                                    pixman_image_get_stride(image));
 }
 
 void qemu_pixman_image_unref(pixman_image_t *image)

util/module.c

@@ -55,13 +55,9 @@ static void init_lists(void)
 
 static ModuleTypeList *find_type(module_init_type type)
 {
-    ModuleTypeList *l;
-
     init_lists();
 
-    l = &init_type_list[type];
-
-    return l;
+    return &init_type_list[type];
 }
 
 void register_module_init(void (*fn)(void), module_init_type type)

vl.c

@@ -2352,10 +2352,7 @@ static int chardev_init_func(void *opaque, QemuOpts *opts, Error **errp)
 #ifdef CONFIG_VIRTFS
 static int fsdev_init_func(void *opaque, QemuOpts *opts, Error **errp)
 {
-    int ret;
-    ret = qemu_fsdev_add(opts);
-
-    return ret;
+    return qemu_fsdev_add(opts);
 }
 #endif