Fix leak in test. am: 78ed97dfda am: 8bc2b0334e am: 60dff18847

Original change: https://android-review.googlesource.com/c/platform/system/unwinding/+/1939381

Change-Id: Ifa95e4c1f486c9f1a592f334be7899968fb06bb1
tree: bcb61a83576f2c4f60530e2474b482405435e4dc
  1. libbacktrace/
  2. libunwindstack/
  3. OWNERS
  4. PREUPLOAD.cfg