RDMA/hns: Remove set but not used variable 'fclr_write_fail_flag'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/infiniband/hw/hns/hns_roce_hw_v2.c: In function 'hns_roce_function_clear':
drivers/infiniband/hw/hns/hns_roce_hw_v2.c:1135:7: warning:
 variable 'fclr_write_fail_flag' set but not used [-Wunused-but-set-variable]

It is never used, so can be removed.
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Reviewed-by: NJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -1132,7 +1132,6 @@ static int hns_roce_cmq_query_hw_info(struct hns_roce_dev *hr_dev)
 
 static void hns_roce_function_clear(struct hns_roce_dev *hr_dev)
 {
-	bool fclr_write_fail_flag = false;
 	struct hns_roce_func_clear *resp;
 	struct hns_roce_cmq_desc desc;
 	unsigned long end;
@@ -1143,7 +1142,6 @@ static void hns_roce_function_clear(struct hns_roce_dev *hr_dev)
 
 	ret = hns_roce_cmq_send(hr_dev, &desc, 1);
 	if (ret) {
-		fclr_write_fail_flag = true;
 		dev_err(hr_dev->dev, "Func clear write failed, ret = %d.\n",
 			 ret);
 		return;