* first adns_submit or _transact call using the same adns_state after
* it became invalid, so you may compare it for equality with other
* query handles until you next call _query or _transact.
* first adns_submit or _transact call using the same adns_state after
* it became invalid, so you may compare it for equality with other
* query handles until you next call _query or _transact.