blk-mq: remove blk_flush_queue_rq

Just call blk_mq_add_to_requeue_list directly from the two callers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230413064057.707578-10-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-flush.c

@@ -136,11 +136,6 @@ static void blk_flush_restore_request(struct request *rq)
 	rq->end_io = rq->flush.saved_end_io;
 }
 
-static void blk_flush_queue_rq(struct request *rq, bool add_front)
-{
-	blk_mq_add_to_requeue_list(rq, add_front, true);
-}
-
 static void blk_account_io_flush(struct request *rq)
 {
 	struct block_device *part = rq->q->disk->part0;
@@ -193,7 +188,7 @@ static void blk_flush_complete_seq(struct request *rq,
 
 	case REQ_FSEQ_DATA:
 		list_move_tail(&rq->flush.list, &fq->flush_data_in_flight);
-		blk_flush_queue_rq(rq, true);
+		blk_mq_add_to_requeue_list(rq, true, true);
 		break;
 
 	case REQ_FSEQ_DONE:
@@ -350,7 +345,7 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
 	smp_wmb();
 	req_ref_set(flush_rq, 1);
 
-	blk_flush_queue_rq(flush_rq, false);
+	blk_mq_add_to_requeue_list(flush_rq, false, true);
 }
 
 static enum rq_end_io_ret mq_flush_data_end_io(struct request *rq,