io_uring: Remove unneeded test in io_run_task_work_sig()

Avoid testing TIF_NOTIFY_SIGNAL twice by calling task_sigpending()
directly from io_run_task_work_sig()

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/bd7c0495f7656e803e5736708591bb665e6eaacd.1645041650.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -7704,11 +7704,11 @@ static int io_run_task_work_sig(void)
 {
 	if (io_run_task_work())
 		return 1;
-	if (!signal_pending(current))
-		return 0;
 	if (test_thread_flag(TIF_NOTIFY_SIGNAL))
 		return -ERESTARTSYS;
-	return -EINTR;
+	if (task_sigpending(current))
+		return -EINTR;
+	return 0;
 }
 
 /* when returns >0, the caller should retry */