[PATCH] Redundant unplug_timer deletion

From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>

The only path to get to del_timer call in __generic_unplug_device() is when
blk_remove_plug() returns 1, and in that case it already removed the
unplug_timer.

Patch to remove this redundant call.

drivers/block/ll_rw_blk.c

@@ -1141,8 +1141,6 @@ static inline void __generic_unplug_device(request_queue_t *q)
 	if (!blk_remove_plug(q))
 		return;
 
-	del_timer(&q->unplug_timer);
-
 	/*
 	 * was plugged, fire request_fn if queue has stuff to do
 	 */