Merge "libutils: check vsnprintf error" into oc-dev am: a03d37d542 am: d8801aaad8 am: d05ecb8d9d am: dc99a094dd am: 64b312bbd8 am: 0cb14f1fe7

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/12254459

Change-Id: I1cb83a4a22e205dddd10536f61392215d5cb33dc