Fix brk/sbrk error checking. am: f36b5088a3 am: 1d358c8ed4  -s ours
am: f3a1f4244d

* commit 'f3a1f4244dd53aa9ff5f3c13578c52d3f74aae86':
  Fix brk/sbrk error checking.

Change-Id: Iedd0f7a24a709b4ee7e9b39fd293d56d71d7ec6f