krb5_auth_con_setrecvsubkey
krb5_auth_con_setrecvsubkey (
retval = krb5_auth_con_setrecvsubkey(context, auth_context, kb);
(void) krb5_auth_con_setrecvsubkey(context, auth_context, NULL);
retval = krb5_auth_con_setrecvsubkey(context, auth_context,
(void) krb5_auth_con_setrecvsubkey(context, auth_context, NULL);