io_uring: reuse io_req_task_queue_fail()

Use io_req_task_queue_fail() on the fail path of io_req_task_queue().
It's unlikely to happen, so don't care about additional overhead, but
allows to keep all the req->result invariant in a single function.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -2011,25 +2011,21 @@ static void io_req_task_submit(struct callback_head *cb)
 	__io_req_task_submit(req);
 }
 
-static void io_req_task_queue(struct io_kiocb *req)
+static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
 {
-	int ret;
+	req->result = ret;
+	req->task_work.func = io_req_task_cancel;
 
-	req->task_work.func = io_req_task_submit;
-	ret = io_req_task_work_add(req);
-	if (unlikely(ret)) {
-		req->result = -ECANCELED;
+	if (unlikely(io_req_task_work_add(req)))
 		io_req_task_work_add_fallback(req, io_req_task_cancel);
-	}
 }
 
-static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
+static void io_req_task_queue(struct io_kiocb *req)
 {
-	req->result = ret;
-	req->task_work.func = io_req_task_cancel;
+	req->task_work.func = io_req_task_submit;
 
 	if (unlikely(io_req_task_work_add(req)))
-		io_req_task_work_add_fallback(req, io_req_task_cancel);
+		io_req_task_queue_fail(req, -ECANCELED);
 }
 
 static inline void io_queue_next(struct io_kiocb *req)