ip_warn
ip_warn(fn, tal_constraints[talid].warn, &cert->ips[i]);
void ip_warn(const char *, const char *, const struct cert_ip *);
ip_warn(fn, "certificate IP", ip);
ip_warn(fn, "offending IP", &ips[i]);
ip_warn(fn, "RFC 6487: uncovered resource", &cert->ips[i]);
ip_warn(fn, "RSC ResourceBlock uncovered", &rsc->ips[i]);