Fix race condition in cleanup part of dns_dt_create()
Originally reported in [ISC-Bugs #46942]: See https://bugs.isc.org/Ticket/Display.html?id=46942 for more details.
Edited by Ondřej Surý
Originally reported in [ISC-Bugs #46942]: See https://bugs.isc.org/Ticket/Display.html?id=46942 for more details.