Merge "Prevent integer overflow in function doProlog" into rvc-qpr-dev am: 18e886dae3 am: b9121fbc5a am: 153fd796c4

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/expat/+/18723663

Change-Id: Ice1422ee2cf5982ab82ffb7b8eb796ade2bd5299
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>