[automerger skipped] Fix use-after-free in DNS64 discovery thread am:...

[automerger skipped] Fix use-after-free in DNS64 discovery thread am: 87676fe7 -s ours am: 851610ee -s ours am: 2af11491 -s ours am: 7b3b4088 -s ours am: 27177c15 -s ours am: fa8fdac7 -s ours am: 0c09007a -s ours

am skip reason: Merged-In Id74ea4e6f54a00805d3cc8a9d7e15e58a473b7d3 with SHA-1 452f032d is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/24557575



Change-Id: I717e784c686d750dc1ab2a24ddecaa0f374414cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>