[Dovecot] backtrace for non-existant %{ldap:attr} on login

[Timo Sirainen]

On 31.10.2012, at 11.08, Steffen Kaiser wrote:

> If mailQuotaBytesTrash or mailQuotaBytes is not present, the LOGIN process does not work:
..
> 2012-10-31 09:56:51 auth: Panic: pool_data_stack_realloc(): stack frame changed

I'm not entirely sure why that happens when nonexistent attributes, but this fixes the crash:
http://hg.dovecot.org/dovecot-2.1/rev/3a33e686fc38

Maybe there's another bug in there as well that tries to write some large garbage to the string instead?..