REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1145 Currently run PatchCheck.py with Python3 will meet following error: ..... File "PatchCheck.py", line 554, in run_git return Result[0].decode('utf-8', 'ignore') if Result[0] and Result[0].find("fatal")!=0 else None TypeError: a bytes-like object is required, not 'str' This issue was introduce by commit:5ac4548cdf654. This patch is to convert the str object of "fatal" to byte object to fix this failure. Cc: Liming Gao <liming.gao@intel.com> Cc: Jaben Carsey <jaben.carsey@intel.com> Cc: Yonghong Zhu <yonghong.zhu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>