Fix OOB write in authToken2AidlVec am: d78ef2348c am: 05adcdadb7

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/keymaster/+/19793608

Change-Id: If85591becd71525b8851e3162ae3eed82f3fcd4c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>