int hashtab_duplicate(struct hashtab *new, struct hashtab *orig,
		int (*copy)(struct hashtab_node *new,
			struct hashtab_node *orig, void *args),
		int (*destroy)(void *k, void *d, void *args),
		void *args)
int hashtab_duplicate(struct hashtab *new, struct hashtab *orig,
		      int (*copy)(struct hashtab_node *new,
				  struct hashtab_node *orig, void *args),
		      int (*destroy)(void *k, void *d, void *args), void *args)