Move memory corruption tests up a directory

test/write_zero_size.c

@@ -0,0 +1,13 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "test_util.h"
+
+OPTNONE int main(void) {
+    char *p = malloc(0);
+    if (!p) {
+        return 1;
+    }
+    *p = 5;
+    return 0;
+}