blk-mq: use helper function to test hw stopped

We have introduced helper function blk_mq_hctx_stopped() to test
BLK_MQ_S_STOPPED.
Signed-off-by: NYufen Yu <yuyufen@huawei.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -1807,7 +1807,7 @@ static void blk_mq_run_work_fn(struct work_struct *work)
 	/*
 	 * If we are stopped, don't run the queue.
 	 */
-	if (test_bit(BLK_MQ_S_STOPPED, &hctx->state))
+	if (blk_mq_hctx_stopped(hctx))
 		return;
 
 	__blk_mq_run_hw_queue(hctx);