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

* commit 'd54ed72cd89cb66211a011e92acd645dcc0c2243':
  Fix brk/sbrk error checking.

Change-Id: I630c562d6642cce13cb1697e4dfed2432323f57e