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

* commit '1d358c8ed4443d358f8a6141071c2445b52c8077':
  Fix brk/sbrk error checking.

Change-Id: I8514cee9e52d38fe8aa92310d9566e8041c58efb