cpu: Remove parameter of list_cpus()

The "optarg" parameter is completely unused, so let's drop it.

Message-Id: <20230419124831.678079-1-thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

cpu.c

@@ -284,7 +284,7 @@ const char *parse_cpu_option(const char *cpu_option)
     return cpu_type;
 }
 
-void list_cpus(const char *optarg)
+void list_cpus(void)
 {
     /* XXX: implement xxx_cpu_list for targets that still miss it */
 #if defined(cpu_list)

include/exec/cpu-common.h

@@ -165,6 +165,6 @@ int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
 /* vl.c */
 extern int singlestep;
 
-void list_cpus(const char *optarg);
+void list_cpus(void);
 
 #endif /* CPU_COMMON_H */

softmmu/vl.c

@@ -2432,7 +2432,7 @@ static void qemu_process_help_options(void)
      * to say '-cpu help -machine something'.
      */
     if (cpu_option && is_help_option(cpu_option)) {
-        list_cpus(cpu_option);
+        list_cpus();
         exit(0);
     }