io_uring: don't use TIF_NOTIFY_SIGNAL to test for availability of task_work

Use task_work_pending() as a better test for whether we have task_work
or not, TIF_NOTIFY_SIGNAL is only valid if the any of the task_work
items had been queued with TWA_SIGNAL as the notification mechanism.
Hence task_work_pending() is a more reliable check.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.h

@@ -266,8 +266,7 @@ static inline int io_run_task_work(void)
 
 static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
 {
-	return test_thread_flag(TIF_NOTIFY_SIGNAL) ||
-		!wq_list_empty(&ctx->work_llist);
+	return task_work_pending(current) || !wq_list_empty(&ctx->work_llist);
 }
 
 static inline int io_run_task_work_ctx(struct io_ring_ctx *ctx)