sk_GENERAL_NAMES_pop_free
sk_GENERAL_NAMES_pop_free(ret, GENERAL_NAMES_free);
sk_GENERAL_NAMES_pop_free(rct_to, GENERAL_NAMES_free);
sk_GENERAL_NAMES_pop_free(rct_from, GENERAL_NAMES_free);
sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);