Anonymous votes override authenticated user votes from same IP

First of all thanks for getting this ready for D6. :)

There appears to be a problem with anonymous votes overwriting user votes when the same IP is used. It looks as though the problem is in votingapi_current_user_identifier() exclusively using IP when $user->uid is zero. This will then cause authenticated user votes to be returned when fed directly into votingapi_select_votes().

I've attached a patch fixing the above. Please review.

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Sammy Spets
Synerger
http://synerger.com