void cluster_unintern(struct cluster_list *cluster)
{
	if (cluster->refcnt)
		cluster->refcnt--;

	if (cluster->refcnt == 0) {
		hash_release(cluster_hash, cluster);
		cluster_free(cluster);
	}
}
void cluster_unintern(struct cluster_list *cluster)
{
	if (cluster->refcnt)
		cluster->refcnt--;

	if (cluster->refcnt == 0) {
		hash_release(cluster_hash, cluster);
		cluster_free(cluster);
	}
}