Correct the if condition expression for DatumType == 'VOID*'. Current this condition is not work since the DatumType is changed before we do the value judgement. Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>