From Marco Jez, fixed typo of OverlayNode.cpp.
From Marco Jez, fixed typo of OverlayNode.cpp.


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