net_protocol_unregister
if (net_protocol_unregister(ipst->ips_ipv4_net_data) == 0)
if (net_protocol_unregister(ipst->ips_ipv6_net_data) == 0)
if (net_protocol_unregister(ipst->ips_arp_net_data) == 0)
extern int net_protocol_unregister(net_handle_t);
VERIFY0(net_protocol_unregister(vnh->vnh_neti));
VERIFY0(net_protocol_unregister(vnh->vnh_neti));