[leafnode-list] Bug in current alpha version

[Hans-Jürgen Ficker]

Hi!

I found a bug in nntpd.c of the current leafnode snapshots. When using
LIST ACTIVE (and probably LIST NEWSGROUPS) with a non-existing
newsgroup name, a NULL pointer derefernce occures. The bug seems
to have introduced in 2.0.0.alpha20031218a (well, leafnode stopped working
for me with that version).

The following (trivial) patch fixes it for me:

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Best regards,
    Hans-J?rgen
-- 
Thunder rolled. ... It rolled a six.

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