Tests: fix test cleanup race condition#803
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bradh352 merged 3 commits intoc-ares:mainfrom Jul 3, 2024
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There was a thread passed data for processing that was cleaned up before thread exit, and it could cause a use-after-free in the test suite. This doesn't affect c-ares. This was found during trying to reproduce #798, but appears unrelated, don't use a helper thread as it isn't necessary.
Fix By: Brad House (@bradh352)