MdeModulePkg Pcd: Refine the code to avoid error report.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@14861 6f19259b-4bc3-4df7-8a09-765794883524
MdeModulePkg/UsbBus: Stop parsing descriptor if some of descriptor fields are invalid.

Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>


git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@14863 6f19259b-4bc3-4df7-8a09-765794883524