Fix errorprone warnings that should be errors am: dd39d0bad5

Original change: https://android-review.googlesource.com/c/platform/packages/apps/ManagedProvisioning/+/2254828

Change-Id: I8f83f3aa0dfcd7a5d9893b291edd65d76d968d45
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>