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
am: 74d59a0302

* commit '74d59a0302a3c3c0a83f96110e0f6949ab84ba91':
  Fix brk/sbrk error checking.

Change-Id: Ib27d423f22a9e8dcade2cd1e9d3e3b0469a47459