mlxsw: spectrum_router: Pass nexthop netdev to mlxsw_sp_nexthop6_type_init()

Instead of passing the route and resolving the nexthop netdev from it,
pass the nexthop netdev directly.

This will later allow us to consolidate code paths between IPv4 and IPv6
code.
Signed-off-by: NIdo Schimmel <idosch@nvidia.com>
Reviewed-by: NJiri Pirko <jiri@nvidia.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -5355,11 +5355,10 @@ static bool mlxsw_sp_nexthop6_ipip_type(const struct mlxsw_sp *mlxsw_sp,
 static int mlxsw_sp_nexthop6_type_init(struct mlxsw_sp *mlxsw_sp,
 				       struct mlxsw_sp_nexthop_group *nh_grp,
 				       struct mlxsw_sp_nexthop *nh,
-				       const struct fib6_info *rt)
+				       const struct net_device *dev)
 {
 	const struct mlxsw_sp_ipip_ops *ipip_ops;
 	struct mlxsw_sp_ipip_entry *ipip_entry;
-	struct net_device *dev = rt->fib6_nh->fib_nh_dev;
 	struct mlxsw_sp_rif *rif;
 	int err;
 
@@ -5417,7 +5416,7 @@ static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
 		return 0;
 	nh->ifindex = dev->ifindex;
 
-	return mlxsw_sp_nexthop6_type_init(mlxsw_sp, nh_grp, nh, rt);
+	return mlxsw_sp_nexthop6_type_init(mlxsw_sp, nh_grp, nh, dev);
 }
 
 static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,