Fix brk/sbrk error checking. am: f36b5088 am: 1d358c8e -s ours am: f3a1f424 am: c0c1abe5 am: b6789dc3 am: d54ed72c am: 02f7869a am: 1d59a2d6 am: 2f78cab2 * commit '2f78cab2': Fix brk/sbrk error checking. Change-Id: I20fce57c0bb3ee7fb99d2a9b10286b79c9458bd2