If the capsule from command line is not present, Buffer will be random value when freeing it in DumpCapsule(), then ASSERT will happen or other memory pool may be freed. Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>