batman-adv: Remove unused function batadv_hash_delete

/* free only the hashtable and the hash itself. */

void batadv_hash_destroy(struct batadv_hashtable *hash);

/* remove the hash structure. if hashdata_free_cb != NULL, this function will be

 * called to remove the elements inside of the hash.  if you don't remove the

 * elements, memory might be leaked.

 */

static inline void batadv_hash_delete(struct batadv_hashtable *hash,

				      batadv_hashdata_free_cb free_cb,

				      void *arg)

{

	struct hlist_head *head;

	struct hlist_node *node, *node_tmp;

	spinlock_t *list_lock; /* spinlock to protect write access */

	u32 i;

	for (i = 0; i < hash->size; i++) {

		head = &hash->table[i];

		list_lock = &hash->list_locks[i];

		spin_lock_bh(list_lock);

		hlist_for_each_safe(node, node_tmp, head) {

			hlist_del_rcu(node);

			if (free_cb)

				free_cb(node, arg);

		}

		spin_unlock_bh(list_lock);

	}

	batadv_hash_destroy(hash);

}

/**

 *	batadv_hash_add - adds data to the hashtable

 *	@hash: storage hash table