if_first_addr_psref
iface_addr = if_first_addr_psref(iface, AF_INET, &psref);
struct ifaddr *if_first_addr_psref(const struct ifnet *, const int, struct psref *);
ifa = if_first_addr_psref(ifp, AF_INET, &psref);
ifa = if_first_addr_psref(ifp, AF_INET, &psref);
ifa = if_first_addr_psref(ifp, AF_INET, &psref);
ifa = if_first_addr_psref(rcvif, AF_INET, &psref_ia);
ifa = if_first_addr_psref(ifp, AF_INET6, &psref_ia);