Fix errorprone warnings that should be errors am: f4521a3e14

Original change: https://android-review.googlesource.com/c/platform/external/turbine/+/2254825

Change-Id: Ifd7962a84b1b70753ccdbad778167d85812662a4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>