Initialized unitialized variables. am: 3e881aa30f am: 7dcdeaa0ac

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2209803

Change-Id: Ifff54c809cbe00b7f2a816da6d2d3f2eac018d5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>