Introduce mg_calloc

src/iobuf.c

@@ -12,18 +12,17 @@ int mg_iobuf_resize(struct mg_iobuf *io, size_t new_size) {
   new_size = roundup(new_size, io->align);
   if (new_size == 0) {
     mg_bzero(io->buf, io->size);
-    free(io->buf);
+    mg_free(io->buf);
     io->buf = NULL;
     io->len = io->size = 0;
   } else if (new_size != io->size) {
-    // NOTE(lsm): do not use realloc here. Use calloc/free only, to ease the
-    // porting to some obscure platforms like FreeRTOS
-    void *p = calloc(1, new_size);
+    // NOTE(lsm): do not use realloc here. Use mg_calloc/mg_free only
+    void *p = mg_calloc(1, new_size);
     if (p != NULL) {
       size_t len = new_size < io->len ? new_size : io->len;
       if (len > 0 && io->buf != NULL) memmove(p, io->buf, len);
       mg_bzero(io->buf, io->size);
-      free(io->buf);
+      mg_free(io->buf);
       io->buf = (unsigned char *) p;
       io->size = new_size;
     } else {