Fix brk/sbrk error checking. am: f36b5088a3 am: 1d358c8ed4  -s ours am: f3a1f4244d
am: c0c1abe518

* commit 'c0c1abe518ae6a7470aaf50f2170c588eca0c69a':
  Fix brk/sbrk error checking.

Change-Id: I8e622e884c0fe5c7262bae9d42971c30f9b2e4a2