[automerge] Fix OOB read for registerLocaleList 2p: fde7f4a25c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/minikin/+/19981131

Bug: 239210579
Bug: 239328580
Bug: 239267173
Change-Id: I796acd87c1c540e96b2f17decf7762dd6f989e9a
Merged-In: Id9c98fc08876656e1f48d12823a24bb7a44bee45