RDMA/hns: Remove unnecessary ret variable from hns_roce_dereg_mr()

mainline inclusion
from mainline-for-linus
commit cc377b9b
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5CHIG
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?id=cc377b9b24c7839531c2c0b7a2165819b578393e

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Fix the following coccicheck warning:

drivers/infiniband/hw/hns/hns_roce_mr.c:343:5-8: Unneeded variable: "ret".

Return 0 directly instead.

Link: https://lore.kernel.org/r/20220426070858.9098-1-guozhengkui@vivo.comSigned-off-by: NGuo Zhengkui <guozhengkui@vivo.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: NZhengfeng Luo <luozhengfeng@h-partners.com>
Reviewed-by: NYangyang Li <liyangyang20@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/infiniband/hw/hns/hns_roce_mr.c

@@ -337,12 +337,11 @@ int hns_roce_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
 	struct hns_roce_mr *mr = to_hr_mr(ibmr);
-	int ret = 0;
 
 	hns_roce_mr_free(hr_dev, mr);
 	kfree(mr);
 
-	return ret;
+	return 0;
 }
 
 struct ib_mr *hns_roce_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,