io_uring: remove extra io_ring_exit_work wake up

task_work_add() takes care of waking up the thread, remove useless
wake_up_process().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/de9a71ee255112dcaed3b5d426be24934e74722c.1633532552.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -9367,7 +9367,6 @@ static __cold void io_ring_exit_work(struct work_struct *work)
 		ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL);
 		if (WARN_ON_ONCE(ret))
 			continue;
-		wake_up_process(node->task);
 
 		mutex_unlock(&ctx->uring_lock);
 		wait_for_completion(&exit.completion);