Fix check for thread unwind. am: 2d5d46ca85

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/18596248

Change-Id: I4470db471380f6ecca9dfb1f06cbc8c73ae29045
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>