OSSL_CMP_ATAV_free
sk_OSSL_CMP_ATAV_pop_free(keySpec, OSSL_CMP_ATAV_free);
OSSL_CMP_ATAV_free(eckeyalg);
OSSL_CMP_ATAV_free(rsakeylen);
sk_OSSL_CMP_ATAV_pop_free(*keySpec, OSSL_CMP_ATAV_free);