Merge "Prevent integer overflow in function doProlog" into qt-dev am: 23374cb334 am: db39a9bc64 am: 32da840156 am: 19ee10132b

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/expat/+/18724031

Change-Id: If329fb39b7222eccc7b59f75fe32cfa548fed891
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>