QMultiMap<QSsl::AlternativeNameEntryType, QString> QSslCertificate::subjectAlternativeNames() const
{
    STACK_OF(GENERAL_NAME) *altNames = (STACK_OF(GENERAL_NAME)*)q_X509_get_ext_d2i(d->x509, NID_subject_alt_name, 0, 0);

    if (altNames) {
        for (int i = 0; i < q_sk_GENERAL_NAME_num(altNames); ++i) {
            const GENERAL_NAME *genName = q_sk_GENERAL_NAME_value(altNames, i);
...
        }
        q_sk_pop_free((STACK*)altNames, reinterpret_cast<void(*)(void*)>(q_sk_free));
    }

    return result;
}

sk_pop_free((STACK *)altNames, reinterpret_cast<void (*)(void *)>(GENERAL_NAME_free));