-CFArrayRef chain_from_der(bool ecdsa, const unsigned char *pkey_der, size_t pkey_der_len, const unsigned char *cert_der, size_t cert_der_len)
+CFArrayRef CF_RETURNS_RETAINED chain_from_der(bool ecdsa, const unsigned char *pkey_der, size_t pkey_der_len, const unsigned char *cert_der, size_t cert_der_len)