block, bfq: remove dead code for updating 'rq_in_driver'

Such code are not even compiled since they are inside marco "#if 0".
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Paolo Valente <paolo.valente@unimore.it>
Link: https://lore.kernel.org/r/20221102022542.3621219-5-yukuai1@huaweicloud.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/bfq-iosched.c

@@ -2321,22 +2321,6 @@ static sector_t get_sdist(sector_t last_pos, struct request *rq)
 	return 0;
 }
 
-#if 0 /* Still not clear if we can do without next two functions */
-static void bfq_activate_request(struct request_queue *q, struct request *rq)
-{
-	struct bfq_data *bfqd = q->elevator->elevator_data;
-
-	bfqd->rq_in_driver++;
-}
-
-static void bfq_deactivate_request(struct request_queue *q, struct request *rq)
-{
-	struct bfq_data *bfqd = q->elevator->elevator_data;
-
-	bfqd->rq_in_driver--;
-}
-#endif
-
 static void bfq_remove_request(struct request_queue *q,
 			       struct request *rq)
 {