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Fix reference counting in get_attached_entry (again)

Ondřej Surý requested to merge 3712-fix-reference-counting-in-dns_adb-get_attached_entry-v2 into main

When get_attached_entry() encounters entry that would be expired, it needs to get reference to the entry before calling maybe_expire_entry(), so the ADB entry doesn't get destroyed inside the its own lock.

This creeped into the code base again during review, so I am adding an extra comment to prevent this.

Closes #3712 (closed)

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