Fix brk/sbrk error checking. am: f36b5088a3 am: 1d358c8ed4  -s ours am: f3a1f4244d am: c0c1abe518 am: b6789dc3b5 am: d54ed72cd8
am: 02f7869aef

* commit '02f7869aefb851d721c3020fca5b35c0ad9de713':
  Fix brk/sbrk error checking.

Change-Id: I31322f99f91feb450792baa2781ad87873a0adc1