nhop_get_rh
struct rib_head *nhop_get_rh(const struct nhop_object *nh);
struct rib_head *rnh = nhop_get_rh(nh);
struct rib_head *rnh = nhop_get_rh(nh);
struct rib_head *rh = nhop_get_rh(wn_new[0].nh);
struct rib_head *rh = nhop_get_rh(wn[0].nh);