cfg_obj_destroy
cfg_obj_destroy(pctx, &file);
cfg_obj_destroy(cfg_parser_t *pctx, cfg_obj_t **obj);
cfg_obj_destroy(pctx, &obj);
cfg_obj_destroy(pctx, &elt->obj);
do { if ((obj) != NULL) cfg_obj_destroy(pctx, &(obj)); } while (0)
cfg_obj_destroy(pctx, &includename);
cfg_obj_destroy(pctx, &eltobj);