RDMA/mlx5: Add missing check for return value in get namespace flow

stable inclusion
from stable-v5.10.137
commit 53da1f0fa0e2e197df1a95729a15b27f7b2b911c
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=53da1f0fa0e2e197df1a95729a15b27f7b2b911c

--------------------------------

[ Upstream commit c9776457 ]

Add missing check for return value when calling to
mlx5_ib_ft_type_to_namespace, even though it can't really fail in this
specific call.

Fixes: 52438be4 ("RDMA/mlx5: Allow inserting a steering rule to the FDB")
Link: https://lore.kernel.org/r/7b9ceda217d9368a51dc47a46b769bad4af9ac92.1659256069.git.leonro@nvidia.comReviewed-by: NItay Aveksis <itayav@nvidia.com>
Signed-off-by: NMaor Gottlieb <maorg@nvidia.com>
Signed-off-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

drivers/infiniband/hw/mlx5/fs.c

@@ -2081,12 +2081,10 @@ static int mlx5_ib_matcher_ns(struct uverbs_attr_bundle *attrs,
 		if (err)
 			return err;
 
-		if (flags) {
-			mlx5_ib_ft_type_to_namespace(
+		if (flags)
+			return mlx5_ib_ft_type_to_namespace(
 				MLX5_IB_UAPI_FLOW_TABLE_TYPE_NIC_TX,
 				&obj->ns_type);
-			return 0;
-		}
 	}
 
 	obj->ns_type = MLX5_FLOW_NAMESPACE_BYPASS;