Fix coding style problem in RngDxe driver.

Signed-off-by: Long, Qin <qin.long@intel.com>
Reviewed-by: Fu, Siyuan <siyuan.fu@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14878 6f19259b-4bc3-4df7-8a09-765794883524
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>
Reviewed-by: Eric Dong <eric.dong@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14879 6f19259b-4bc3-4df7-8a09-765794883524