stdlib: fix bad memset in calloc()

src/libc/stdlib/calloc.c

@@ -9,6 +9,6 @@ void *calloc(size_t nmemb, size_t size)
 		return NULL;
 
 	void *mem = malloc(total_size);
-	if(mem) memset(mem, 0, size);
+	if(mem) memset(mem, 0, total_size);
 	return mem;
 }