silc-client segfault when using /quit or disconnect

Hi there,

let me introduce a bug from the launchpad bug tracker to you:

https://bugs.launchpad.net/ubuntu/+source/silc-client/+bug/275989

It seems, that silc-client crashes when you are using "/key channel"
protected channels and use /quit or get a disconnect. In order to
reproduce it, try:

- start silc session
- connect to a server
- join a channel that has a "/key channel CHANNELNAME password PASSWORD"
  set and set it
- "/quit"

silc-client will crash with a hint on "silccipher.c:377" when having
debug symbols installed. it will also crash, when you have a forced
disconnect (due to connectivity).

You'll find a backtrace here:

http://launchpadlibrarian.net/18055254/silc-gdb.txt

I assume there needs to be a check like 

"if (!(channel->internal.send_key == NULL))" close to silccipher.c:377

this behaviour has been found on Ubuntu Hardy and Intrepid. Maybe a
check against the newest release is necessary.


I hope these information help investigating the bug. If you provide a
patch, I'll send it to the Debian and Ubuntu project.

Best.

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