fix up lynxchan migrate script such that it exits
fix up lynxchan migrate script such that it exits

chen-chan/nntpchan,majestrate/nntpchan,majestrate/nntpchan,majestrate/nntpchan,chen-chan/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,majestrate/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,chen-chan/nntpchan,chen-chan/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,chen-chan/nntpchan