[redland] possible defect in rdf_serializer.c (0.9.12)

[Seth Ladd]

I sent this out once, but I never received it via the mailing list, so 
please excuse this if it's a repost.

While playing with 0.9.12 (downloaded Saturday) I discovered what is 
probably a small defect in rdf_serializer.c.

In librdf_get_serializer_factory, I believe a '!' needs to get added at 
the check for uri_equals of the type->uri, near the bottom of the function.

It should read:

if(type_uri && factory->type_uri &&
    ! librdf_uri_equals(factory->type_uri, type_uri)) {
   continue;
}

Once I added this, example4 started to work w/ the included ntriples 
serializer.  Due to debug statements I added in, the code was previously 
saying "if the uri of the factory matches the given uri, don't 
acknowledge it".

I hope this helps!

Thanks for a wonderful and extremely helpful library,
Seth