The block returned from Mtftp4RemoveBlockNum is not the total received and saved block number if it works in passive (Slave) mode. The issue was exposed by the EMS test. Cc: Ye Ting <ting.ye@intel.com> Cc: Fu Siyuan <siyuan.fu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com> Reviewed-by: Ye Ting <ting.ye@intel.com>