block/rnbd-clt: Remove the unneeded result variable

Return the value from rtrs_clt_rdma_cq_direct() directly instead of
storing it in another redundant variable.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20220824075213.221397-1-ye.xingchen@zte.com.cnSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-clt.c

@@ -1159,10 +1159,8 @@ static int rnbd_rdma_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
 {
 	struct rnbd_queue *q = hctx->driver_data;
 	struct rnbd_clt_dev *dev = q->dev;
-	int cnt;
 
-	cnt = rtrs_clt_rdma_cq_direct(dev->sess->rtrs, hctx->queue_num);
-	return cnt;
+	return rtrs_clt_rdma_cq_direct(dev->sess->rtrs, hctx->queue_num);
 }
 
 static void rnbd_rdma_map_queues(struct blk_mq_tag_set *set)