Fix errorprone warnings that should be errors am: 40710ba037

Original change: https://android-review.googlesource.com/c/platform/external/caliper/+/2255923

Change-Id: I8eef66944e5ffb02858a210e929975b80d47af1f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>