Add pointer check to avoid NULL pointer dereferenced. Cc: Jaben Carsey <jaben.carsey@intel.com> Cc: Tapan Shah <tapandshah@hpe.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Qiu Shumin <shumin.qiu@intel.com> Reviewed-by: Tapan Shah <tapandshah@hpe.com>