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 am: b472137a am: 0d7fdf14 * commit '0d7fdf14': Fix brk/sbrk error checking. Change-Id: I8ef9e4a387599a330e75985f740973f941cc335f