am 3fa8b550: am 93f106b8: am e97682be: am a1a22b57: am e67b5848: am 4956c0fe: am 5b85b1d4: libutils: fix overflow in String8::allocFromUTF8

* commit '3fa8b550eadeef21e2ca996c44e37f84b1418f95':
  libutils: fix overflow in String8::allocFromUTF8