blk-mq: Rename blk_mq_request_direct_issue() into blk_mq_request_issue_directly()

Most blk-mq functions have a name that follows the pattern blk_mq_${action}.
However, the function name blk_mq_request_direct_issue is an exception.
Hence rename this function. This patch does not change any functionality.

Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-mq.h b/block/blk-mq.h
index e3ebc93..88c558f 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -75,7 +75,7 @@
 				struct list_head *list);
 
 /* Used by blk_insert_cloned_request() to issue request directly */
-blk_status_t blk_mq_request_direct_issue(struct request *rq);
+blk_status_t blk_mq_request_issue_directly(struct request *rq);
 
 /*
  * CPU -> queue mappings