RDMA/hns: Init the variable at the suitable place

Assigning a value to ret in the init statement of a for-loop makes the
code less readable.

Link: https://lore.kernel.org/r/20220409083254.9696-6-liangwenpeng@huawei.comSigned-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -1296,7 +1296,8 @@ static int __hns_roce_cmq_send(struct hns_roce_dev *hr_dev,
 	} while (++timeout < priv->cmq.tx_timeout);
 
 	if (hns_roce_cmq_csq_done(hr_dev)) {
-		for (ret = 0, i = 0; i < num; i++) {
+		ret = 0;
+		for (i = 0; i < num; i++) {
 			/* check the result of hardware write back */
 			desc[i] = csq->desc[tail++];
 			if (tail == csq->desc_num)