utils/cache_gc: fix crashes/assertions on RTT entries

I missed some parts when finishing this. I should've tested it better. GC would hit assertions or NULL dereferences when removing entries, and eventually that would lead to cache overflowing (and getting cleared).

changed milestone to %5.3.1

added bug label

added 1 commit

• 3fbbc909 - ci: run simple GC sanity check

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Will the CI job fail if the kres-cache-gc process dies? EDIT: otherwise I do like the idea.

Yes, it would've detected this error: https://gitlab.nic.cz/knot/knot-resolver/-/jobs/506931

approved this merge request

mentioned in commit 9679a48b

merged