BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=2099
This is a regression issue introduced by commit e8449e.
This patch is to fix this issue.
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>