IB/providers: Avoid null netdev check for RoCE

Now that IB core GID cache ensures that all RoCE entries have an
associated netdev remove null checks from the provider drivers for
clarity.

Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/ocrdma/ocrdma_ah.c

@@ -193,11 +193,9 @@ struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct rdma_ah_attr *attr,
 		      __func__, status);
 		goto av_conf_err;
 	}
-	if (sgid_attr.ndev) {
-		if (is_vlan_dev(sgid_attr.ndev))
-			vlan_tag = vlan_dev_vlan_id(sgid_attr.ndev);
-		dev_put(sgid_attr.ndev);
-	}
+	if (is_vlan_dev(sgid_attr.ndev))
+		vlan_tag = vlan_dev_vlan_id(sgid_attr.ndev);
+	dev_put(sgid_attr.ndev);
 	/* Get network header type for this GID */
 	ah->hdr_type = ib_gid_to_network_type(sgid_attr.gid_type, &sgid);