Lint: Initialize variables, log variables on error am: 8fffea9d60

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2675709

Change-Id: I936e7e32a9ec4bbc991dad4c9da85e648be5e0e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>