[horde] horde_hook_postauthenticate called after logout

[Chuck Hagenbuch]

Quoting "Michael Menge" <michael.menge at zdv.uni-tuebingen.de>:

>> I'm not seeing how this can happen; if it is happening it's definitely
>> a bug. You can log the output of print_r(debug_backtrace(true))
>> (warning, it'll be pretty big) to see the call chain of how it's
>> getting there.
>
> Here is the log. I removed the password lines.
> I found out that the hook is not called on logout but during normal   
> usage of horde. But i dont know which actions triggert the hook.

Replying back to the list, without the log. I think I figured out  
what's going on. Can you try the attached patch, please?

Thanks,
-chuck
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