[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: a5f7f11a -s ours am: 30146bff -s ours am: 0dcc64d0 -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: I66019d6514993760f757ffa1f9869b2e51dce51b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>