Always use unsigned char am: 5c9670f28e am: 59d2e4bfdc am: 8a7f386033 am: 5c319574a0 am: f7636b83d8 am: 6f2ae652d9 am: d9ceae7a11 am: efc23e166f am: d8678e88bf am: 2c8445ba6d  -s ours
am: e7ac34038c

Change-Id: If949fcf6479a46ce81afa655e85caafa26c8aa63