dm vdo wait-queue: remove unused debug function vdo_waitq_get_next_waiter

Reviewed-by: Ken Raeburn <raeburn@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Matthew Sakai <msakai@redhat.com>

drivers/md/dm-vdo/wait-queue.c

@@ -207,21 +207,3 @@ bool vdo_waitq_notify_next_waiter(struct vdo_wait_queue *waitq,
 
 	return true;
 }
-
-/**
- * vdo_waitq_get_next_waiter() - Get the waiter after this one, for debug iteration.
- * @waitq: The vdo_wait_queue.
- * @waiter: A waiter.
- *
- * Return: The next waiter, or NULL.
- */
-const struct vdo_waiter *vdo_waitq_get_next_waiter(const struct vdo_wait_queue *waitq,
-						   const struct vdo_waiter *waiter)
-{
-	struct vdo_waiter *first_waiter = vdo_waitq_get_first_waiter(waitq);
-
-	if (waiter == NULL)
-		return first_waiter;
-
-	return ((waiter->next_waiter != first_waiter) ? waiter->next_waiter : NULL);
-}

drivers/md/dm-vdo/wait-queue.h

@@ -135,7 +135,4 @@ static inline size_t __must_check vdo_waitq_num_waiters(const struct vdo_wait_qu
 	return waitq->length;
 }
 
-const struct vdo_waiter * __must_check
-vdo_waitq_get_next_waiter(const struct vdo_wait_queue *waitq, const struct vdo_waiter *waiter);
-
 #endif /* VDO_WAIT_QUEUE_H */