SecurityPkg/VariableSmm: Fix a VariableSmm bug when reading variable with size 0.

Signed-off-by: Tian, Feng <feng.tian@intel.com>
Reviewed-by: Zhang, Chao <chao.b.zhang@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13726 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed