hash_delete
dbp->del = hash_delete;
static int hash_delete(const DB *, const DBT *, u_int32_t);
void hash_delete(struct hash *);
int hash_delete(hash_table *, const void *, int);
hash_delete(_this->ctrl_map, (void *)(uintptr_t)tunid, 0);
if (hash_delete(_this->map_user_ppp,
hash_delete(_this->acookie_hash,
hash_delete(_this->session_hash,
hash_delete(_this->call_id_map, CALL_KEY(call), 0);