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

* commit '2f78cab2026db556b166386323542708a3bc6ba3':
  Fix brk/sbrk error checking.

Change-Id: I20fce57c0bb3ee7fb99d2a9b10286b79c9458bd2