RDMA/cma: Simplify netdev check

Current code checks for NULL ndev twice where 2nd check is always
invalid given the fact that during route resolving stage, device address
must be bound to netdevice interface.

This patch simplifies such check.
Signed-off-by: NParav Pandit <parav@mellanox.com>
Reviewed-by: NDaniel Jurgens <danielj@mellanox.com>
Signed-off-by: NLeon Romanovsky <leon@kernel.org>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/cma.c

@@ -2527,8 +2527,10 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 	struct rdma_addr *addr = &route->addr;
 	struct cma_work *work;
 	int ret;
-	struct net_device *ndev = NULL;
+	struct net_device *ndev;
 	enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
+	unsigned long supported_gids;
+
 	u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
 					rdma_start_port(id_priv->cma_dev->device)];
 	u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
@@ -2549,30 +2551,25 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 
 	route->num_paths = 1;
 
-	if (addr->dev_addr.bound_dev_if) {
-		unsigned long supported_gids;
-
-		ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
-		if (!ndev) {
-			ret = -ENODEV;
-			goto err2;
-		}
-
-		supported_gids = roce_gid_type_mask_support(id_priv->id.device,
-							    id_priv->id.port_num);
-		gid_type = cma_route_gid_type(addr->dev_addr.network,
-					      supported_gids,
-					      id_priv->gid_type);
-		route->path_rec->rec_type =
-			sa_conv_gid_to_pathrec_type(gid_type);
-		sa_path_set_ndev(route->path_rec, &init_net);
-		sa_path_set_ifindex(route->path_rec, ndev->ifindex);
+	if (!addr->dev_addr.bound_dev_if) {
+		ret = -ENODEV;
+		goto err2;
 	}
+
+	ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
 	if (!ndev) {
 		ret = -ENODEV;
 		goto err2;
 	}
 
+	supported_gids = roce_gid_type_mask_support(id_priv->id.device,
+						    id_priv->id.port_num);
+	gid_type = cma_route_gid_type(addr->dev_addr.network,
+				      supported_gids,
+				      id_priv->gid_type);
+	route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
+	sa_path_set_ndev(route->path_rec, &init_net);
+	sa_path_set_ifindex(route->path_rec, ndev->ifindex);
 	sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
 
 	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,