[syslinux] [tftp-hpa] tftp exit status is always 0

[Felix Radensky]

Hi,

Now that it's possible to run tftp non interactively, it would
be nice to get a non zero exit status in case of failure.

Currently exit status is always 0, which makes tftp usage in
scripts a bit inconvenient, as one has to parse its output.

Thanks.

Please CC me, as I'm not on the list.

Felix.