Fix errorprone warnings that should be errors am: 40710ba037 am: a913564d21

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

Change-Id: Ifcb77367b6237bb923c24f38341a0f0065d19c61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>