block: remove __blk_put_request()

Now there's no difference between blk_put_request() and
__blk_put_request() anymore, get rid of the underscore version and
convert the few callers.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index c6ad007..4e27460 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1390,7 +1390,7 @@ sg_rq_end_io(struct request *rq, blk_status_t status)
 	 */
 	srp->rq = NULL;
 	scsi_req_free_cmd(scsi_req(rq));
-	__blk_put_request(rq->q, rq);
+	blk_put_request(rq);
 
 	write_lock_irqsave(&sfp->rq_list_lock, iflags);
 	if (unlikely(srp->orphan)) {