block: make kblockd_schedule_work() take the queue as parameter

Preparatory patch for checking queuing affinity.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 1e2aff8..5f6fd28 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -244,7 +244,7 @@
 {
 	if (cfqd->busy_queues) {
 		cfq_log(cfqd, "schedule dispatch");
-		kblockd_schedule_work(&cfqd->unplug_work);
+		kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work);
 	}
 }