lwtstate_get
nhc->nhc_lwtstate = lwtstate_get(lwtstate);
rt->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate);
new_rt->dst.lwtstate = lwtstate_get(rt->dst.lwtstate);
rth->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate);
rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);