Bugfix: valgrind memory issues (#314)

src/md-workbench.c

@@ -6,6 +6,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <math.h>
+#include <assert.h>
 
 #include "md-workbench.h"
 #include "config.h"
@@ -343,7 +344,8 @@ static int compare_floats(time_result_t * x, time_result_t * y){
 }
 
 static double runtime_quantile(int repeats, time_result_t * times, float quantile){
-  int pos = round(quantile * repeats + 0.49);
+  int pos = round(quantile * (repeats - 1) + 0.49);
+  assert(pos < repeats);
   return times[pos].runtime;
 }
 

src/mdtest.c

@@ -668,6 +668,7 @@ void mdtest_read(int random, int dirs, const long dir_iter, char *path) {
         if (alloc_res) {
             FAIL("out of memory");
         }
+        memset(read_buffer, -1, o.read_bytes);
     }
 
     uint64_t stop_items = o.items;