void free_tconfig_r(struct tconfig_block *tcfg)
{
  if (tcfg->child)
    free_tconfig_r(tcfg->child);

  if (tcfg->next)
    free_tconfig_r(tcfg->next);

  free(tcfg->key);
  free(tcfg->value);
  free(tcfg);
}