block: fix bad spelling of quiesce

Credit goes to Andrew Morton for spotting this one.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 73f36be..cac4e9f 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -209,14 +209,14 @@
 	ssize_t ret = queue_var_store(&stats, page, count);
 
 	spin_lock_irq(q->queue_lock);
-	elv_quisce_start(q);
+	elv_quiesce_start(q);
 
 	if (stats)
 		queue_flag_set(QUEUE_FLAG_IO_STAT, q);
 	else
 		queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
 
-	elv_quisce_end(q);
+	elv_quiesce_end(q);
 	spin_unlock_irq(q->queue_lock);
 
 	return ret;