Replaced ref_ptr<>:take with ref_ptr<>:release, and added handling of removeal

of ref_ptr<> operator >.

src/osgPlugins/lws/ReaderWriterLWS.cpp

@@ -48,7 +48,7 @@ public:
         lwosg::SceneLoader scene_loader(conv_options);
         osg::ref_ptr<osg::Node> node = scene_loader.load(fileName, local_opt.get());
         if (node.valid()) {
-            return node.take();
+            return node.release();
         }
 
         return ReadResult::FILE_NOT_HANDLED;