mlxsw_sp_nexthop_next
struct mlxsw_sp_nexthop *mlxsw_sp_nexthop_next(struct mlxsw_sp_router *router,
for (nh = mlxsw_sp_nexthop_next(router, NULL); nh; \
nh = mlxsw_sp_nexthop_next(router, nh))