splice_to_pipe(): don't open-code wakeup_pipe_readers()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/splice.c

@@ -242,10 +242,7 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
 		}
 
 		if (do_wakeup) {
-			smp_mb();
-			if (waitqueue_active(&pipe->wait))
-				wake_up_interruptible_sync(&pipe->wait);
-			kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+			wakeup_pipe_readers(pipe);
 			do_wakeup = 0;
 		}