minor bug in nsd-xfer

[Nick Hilliard]

> May be the patch in http://www.nlnetlabs.nl/bugs/show_bug.cgi?id=94
> will help you? Warning: I have not tested it on a production machine.

It may work and it looks like something which might be useful anyway,
but it doesn't look like it's getting to the root of this particular
problem. nsd-xfer appears to be spinning somewhere and chewing up CPU,
which is bad stuff.  This shouldn't happen in the first place.

It might be helpful if Peter compiled a version of nsd-xfer with
debugging symbols enabled and then attached gdb to the process to see
where it's looping.  A backtrace would be good.

Nick