Fix warnings am: 04f10af8db

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2971281

Change-Id: Ide8729289c5afc66ce49aa1294663957552a9f9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>