* In old implementation, the operation len-- assumes AsciiSPrint() has counted NULL terminator, and it's not correct. This patch is to fix this issue. Cc: Fu Siyuan <siyuan.fu@intel.com> Cc: Ye Ting <ting.ye@intel.com> Cc: Jiaxin Wu <jiaxin.wu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Wang Fan <fan.wang@intel.com> Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>