am ea5adb57: am cb7e8c5e: libc: update alarm() implementation to return 0 on error.

Merge commit 'ea5adb571e664e5d0444230169062baaa996686f'

* commit 'ea5adb571e664e5d0444230169062baaa996686f':
  libc: update alarm() implementation to return 0 on error.