am ab8b5410: libc: fix fstatfs() implementation.

Merge commit 'ab8b54101eed0a4b92ebf8fa6994cd1b4f22d8f4' into gingerbread-plus-aosp

* commit 'ab8b54101eed0a4b92ebf8fa6994cd1b4f22d8f4':
  libc: fix fstatfs() implementation.