Fix a bug that mtftp4 driver reply 2 ACK in answer to incoming No.65535 block data. That issue incurs incorrect network transfer.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10619 6f19259b-4bc3-4df7-8a09-765794883524
4 files changed