plugin_free (struct backend *b)
{
  struct backend_plugin *p = container_of (b, struct backend_plugin, backend);

  backend_unload (b, p->plugin.unload);
  free (p);
}
plugin_free (struct backend *b)
{
  struct backend_plugin *p = container_of (b, struct backend_plugin, backend);

  backend_unload (b, p->plugin.unload);
  free (p);
}