[python-ldap] Memory leak fixes.

[Michael Ströder]

Chris,

Chris Mikkelson wrote:
> Two patches attached.
> 
> The first cleans up a previously-leaked object in a few
> exception cases.
> 
> The second fixes a leak of an empty list for every
> intermediate message, which was causing trouble in
> a long-running ldap sync client.

many thanks for the patches. I'm also observing growing memory in my
long-running web2ldap demo service.

I've committed these patches in CVS HEAD.
So please everybody should test and report problems.

Ciao, Michael.