Fix errorprone warnings that should be errors am: 27db4326e4

Original change: https://android-review.googlesource.com/c/platform/packages/apps/DocumentsUI/+/2256451

Change-Id: If12028187816759809fc4c33064715db9471d1e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>