static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
{
	if (likely(!(req->flags & REQ_F_LINK_HEAD)))
		return NULL;
	return __io_req_find_next(req);
}
static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
{
	if (likely(!(req->flags & REQ_F_LINK_HEAD)))
		return NULL;
	return __io_req_find_next(req);
}