[krbdev.mit.edu #8666] Explicit NULL deref in finish_dispatch()

[Greg Hudson via RT]

I guess this happens any time a response to a TGS request is too big to 
fit into a datagram, which is rare with the DB2 or LDAP KDB module but 
could easily happen with a KDB module supporting PACs.

We also need to figure out when this bug was introduced.  It might have 
been commit 0a2f14f752c32a24200363cc6b6ae64a92f81379 but not 
necessarily.  I can do that research.