thread_audit_test() reports failures through its return value, but
audit.thread joins the thread with a NULL result pointer, so these
failures go unnoticed.
Check the returned value, as the other thread-based audit tests do.
Signed-off-by: Günther Noack <redacted>
Sashiko has reviewed this patch and found no issues.
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Sashiko AI review · https://sashiko.dev/#/patchset/20261104-selftests-refactor-v2-0-c52f23f7ce33@gmail.com?part=3