[syslinux] tftpd resends option ack during transfer

[Tim Newsome]

Uploading a >32MB file from a recent curl to tftpd fails because when the
block number rolls back to 0, tftpd transmits the option ack again, instead
of transmitting an acknowledgment for the block received. You don't see this
problem when using the bundled tftp client because it doesn't set any of the
options when uploading a file. Attached is a patch that fixes this, tested
against the current git repository.

Tim
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