Append double-null for Type 19 data record.

Signed-off-by: lzeng14
Reviewed-by: li-elvin

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12983 6f19259b-4bc3-4df7-8a09-765794883524
3 files changed