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.h b/block/blk.h
index 24fcaee..5dfc412 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -70,8 +70,8 @@
 
 int blk_dev_init(void);
 
-void elv_quisce_start(struct request_queue *q);
-void elv_quisce_end(struct request_queue *q);
+void elv_quiesce_start(struct request_queue *q);
+void elv_quiesce_end(struct request_queue *q);
 
 
 /*