This commit rewrites the logic for NetblockChecksum. It processes the checksum of the left-over byte first to prevent possible mis-reports by static code checkers. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Fu Siyuan <siyuan.fu@intel.com> Reviewed-by: Ye Ting <ting.ye@intel.com> Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>