OpenSSL::X509::CRL#next_update

static VALUE
ossl_x509crl_get_next_update(VALUE self)
{
    X509_CRL *crl;
    const ASN1_TIME *time;

    GetX509CRL(self, crl);
    time = X509_CRL_get0_nextUpdate(crl);
    if (!time)
        return Qnil;

    return asn1time_to_time(time);
}