https://bugzilla.tianocore.org/show_bug.cgi?id=417 The commit makes the following refinements in GenVtf source codes to avoid VS2010/VS2012 build failure: 1. Refines coding style to declare local variables at the beginning of a code block in function 'main'. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>