small optimization to the osgb/t serializers.
small optimization to the osgb/t serializers.

tomasthoresen/osg,jtorresfabra/osg,tomasthoresen/osg,artoolkit/osg,scrawl/osg,scrawl/osg,jtorresfabra/osg,openscenegraph/osg,artoolkit/osg,marchelbling/osg,openscenegraph/osg,tomasthoresen/osg,artoolkit/osg,jtorresfabra/osg,openscenegraph/osg,marchelbling/osg,artoolkit/osg,jtorresfabra/osg,marchelbling/osg,tomasthoresen/osg,scrawl/osg,scrawl/osg,openscenegraph/osg,marchelbling/osg