sched/wait, rcuwait: Fix typo in comment

Forgot to update the comment after renaming the call.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Link: http://lkml.kernel.org/r/1485704532-9290-1-git-send-email-dave@stgolabs.netSigned-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/rcuwait.h

@@ -47,7 +47,7 @@ extern void rcuwait_wake_up(struct rcuwait *w);
 	for (;;) {							\
 		/*							\
 		 * Implicit barrier (A) pairs with (B) in		\
-		 * rcuwait_trywake().					\
+		 * rcuwait_wake_up().					\
 		 */							\
 		set_current_state(TASK_UNINTERRUPTIBLE);		\
 		if (condition)						\