[Dovecot] Fix for the consume_results leak

[Timo Sirainen]

On Fri, 2010-03-26 at 15:50 +0100, Rainer Weikusat wrote:
> I'm not really comfortable with making non-trivial changes to this
> code but here is at least a fix for the PGresult leak (verified to
> both apply to 1.2.11 and 2.0.beta4).

Thanks. I did a slightly different change though:
http://hg.dovecot.org/dovecot-2.0/rev/5a6aaf88f15c

(the extra result->pgres = NULL probably doesn't fix anything, but
avoids potential problems and it wasn't worth a separate commit :)

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