futex: Drop leftover wake_q_add() comment

Since the original comment, we have moved to do the task
reference counting explicitly along with wake_q_add_safe().
Drop the now incorrect comment.

Signed-off-by: Davidlohr Bueso <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

kernel/futex.c

@@ -1480,7 +1480,7 @@ static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
 
 	/*
 	 * Queue the task for later wakeup for after we've released
-	 * the hb->lock. wake_q_add() grabs reference to p.
+	 * the hb->lock.
 	 */
 	wake_q_add_safe(wake_q, p);
 }