bsg: Add sparse annotations to bsg_request_fn()

Avoid that sparse complains about unbalanced lock actions.
Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: NJens Axboe <axboe@fb.com>

block/bsg-lib.c

@@ -161,6 +161,8 @@ static int bsg_create_job(struct device *dev, struct request *req)
  * Drivers/subsys should pass this to the queue init function.
  */
 void bsg_request_fn(struct request_queue *q)
+	__releases(q->queue_lock)
+	__acquires(q->queue_lock)
 {
 	struct device *dev = q->queuedata;
 	struct request *req;