Fix malloc_bench calloc logic (#20648)

Author: kripken

test/malloc_bench.c

@@ -86,11 +86,11 @@ void randoms() {
         }
       } else {
         if (calloc_ && USE_CALLOC) {
-          bins[bin] = malloc(size);
+          bins[bin] = calloc(size, 1);
           allocated[bin] = size;
           total_allocated += size;
         } else {
-          bins[bin] = calloc(size, 1);
+          bins[bin] = malloc(size);
           allocated[bin] = size;
           total_allocated += size;
         }