Fix brk/sbrk error checking. am: f36b5088a3 am: 1d358c8ed4  -s ours am: f3a1f4244d am: c0c1abe518 am: b6789dc3b5 am: d54ed72cd8 am: 02f7869aef am: 1d59a2d6c3 am: 2f78cab202 am: b472137abf
am: 0d7fdf1499

* commit '0d7fdf149998059f4b3ac115d191ab53bf1b2f43':
  Fix brk/sbrk error checking.

Change-Id: I8ef9e4a387599a330e75985f740973f941cc335f