Fix errorprone warnings that should be errors am: a2570eedf1 am: 034e5f5a6f am: 056936fc0d

Original change: https://android-review.googlesource.com/c/platform/external/jackson-databind/+/2256745

Change-Id: I6d886024f914334f067a431f9287c75e9aa3648b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>