GCC 4.6 generates a warning when a variable is set,
but never used.
Signed-off-by: jljusten
Reviewed-by: lgao4
Reviewed-by: erictian
Reviewed-by: rsun3
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12617 6f19259b-4bc3-4df7-8a09-765794883524