The AllocateCopyPool in function ExtractFileNameFromDevicePath may return NULL, so need to do error handling. This patch is to add error handling codes for function ExtractFileNameFromDevicePath and its caller functions. Cc: Eric Dong <eric.dong@intel.com> Cc: Hao Wu <hao.a.wu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>