blk-mq: use if-else instead of goto in blk_mq_alloc_cached_request()

if-else is more readable than goto here.
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Link: https://lore.kernel.org/r/d3306fa4e92dc9cc614edc8f1802686096bafef2.1667356813.git.nickyc975@zju.edu.cnSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -575,14 +575,14 @@ static struct request *blk_mq_alloc_cached_request(struct request_queue *q,
 
 	if (!plug)
 		return NULL;
+
 	if (rq_list_empty(plug->cached_rq)) {
 		if (plug->nr_ios == 1)
 			return NULL;
 		rq = blk_mq_rq_cache_fill(q, plug, opf, flags);
-		if (rq)
-			goto got_it;
+		if (!rq)
 			return NULL;
-	}
+	} else {
 		rq = rq_list_peek(&plug->cached_rq);
 		if (!rq || rq->q != q)
 			return NULL;
@@ -593,7 +593,8 @@ static struct request *blk_mq_alloc_cached_request(struct request_queue *q,
 			return NULL;
 
 		plug->cached_rq = rq_list_next(rq);
-got_it:
+	}
+
 	rq->cmd_flags = opf;
 	INIT_LIST_HEAD(&rq->queuelist);
 	return rq;