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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If8dbb9019cea7de76bfc5d674c1e2db9ea574762