iter_deinit
NULL, NULL, &iter_init, &iter_deinit, &iter_operate,
void iter_deinit(struct module_env* env, int id);
if(fptr == &iter_deinit) return 1;
NULL, NULL, &iter_init, &iter_deinit, &iter_operate,
void iter_deinit(struct module_env* env, int id);
if(fptr == &iter_deinit) return 1;