if (size > ofpbuf_tailroom(b)) {
size_t new_allocated = b->allocated + MAX(size, 64);
void *new_base = xmalloc(new_allocated);
if (size > ofpbuf_tailroom(b)) {
size_t new_allocated = b->allocated + MAX(size, 64);
void *new_base = xmalloc(new_allocated);