Merge "Appease UB sanitizer on reading gatekeeper error codes." am: f1473a3ae3 am: 78adc89fcd

Original change: https://android-review.googlesource.com/c/platform/system/gatekeeper/+/1553309

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If26fd608c38fface90f13533153876f18c715d83