Merge "libutils: check vsnprintf error" into oc-dev am: a03d37d5 am: d8801aaa am: d05ecb8d

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

Change-Id: I816b8858c69e6481299f942401a16b5b39cd8b69