EVP_MAC_up_ref
EVP_MAC_up_ref(mac);
|| !EVP_MAC_up_ref(mac)) {
if (!EVP_MAC_up_ref(dst->meth)) {
EVP_MAC_up_ref(dest->mac);
EVP_MAC_up_ref(src->hmac);
int EVP_MAC_up_ref(EVP_MAC *mac);