io_uring: align iowq and task request error handling

There is a difference in how io_queue_sqe and io_wq_submit_work treat
error codes they get from io_issue_sqe. The first one fails anything
unknown but latter only fails when the code is negative.

It doesn't make sense to have this discrepancy, align them to the
io_queue_sqe behaviour.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c550e152bf4a290187f91a4322ddcb5d6d1f2c73.1721819383.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/io_uring.c

@@ -1849,7 +1849,7 @@ void io_wq_submit_work(struct io_wq_work *work)
 	} while (1);
 
 	/* avoid locking problems by failing it from a clean context */
-	if (ret < 0)
+	if (ret)
 		io_req_task_queue_fail(req, ret);
 }