Facet count does not match number of results returned

Thanks for this excellent module.

In the course of my project, I discovered that in some cases the facet count does not match the number of results returned. It counts the same node multiple times. This happens when a user subscribe to a public group (using og module). Since the group is public and the user is also subscribed to it, it will double count all the posts within that group.

I have attached a patch that fixes this problem, but what do you think, will it have side effects?

Thanks again for this wonderful module, it works great.