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

* commit '1d59a2d6c3836e8f3a85062ce6725ae489c0122b':
  Fix brk/sbrk error checking.

Change-Id: I3cc097839dfc3534f31c114c15bc89dedb6ba866