Fix brk/sbrk error checking. am: f36b5088 am: 1d358c8e -s ours am: f3a1f424 am: c0c1abe5 am: b6789dc3 am: d54ed72c * commit 'd54ed72c': Fix brk/sbrk error checking. Change-Id: I630c562d6642cce13cb1697e4dfed2432323f57e