free_krb5_external_principal_identifier
void free_krb5_external_principal_identifier(krb5_external_principal_identifier ***in);
free_krb5_external_principal_identifier(&certifiers);
free_krb5_external_principal_identifier(&krb5_verified_chain);
free_krb5_external_principal_identifier(&krb5_trusted_certifiers);
free_krb5_external_principal_identifier(&krb5_cas);
free_krb5_external_principal_identifier(&(*in)->trustedCertifiers);