Fixed LWO2 ReaderWriter problem which was down to an the compiler reodering

the evaluation of a Vec3 paramter.

src/osg/ClearNode.cpp

@@ -7,14 +7,12 @@ using namespace osg;
 /**
  * ClearNode constructor.
  */
-ClearNode::ClearNode()
+ClearNode::ClearNode():
+    _requiresClear(true),
+    _clearColor(0.0f,0.0f,0.0f,1.0f)
 {
     StateSet* stateset = osgNew StateSet;
     stateset->setRenderBinDetails(-1,"RenderBin");
     setStateSet(stateset);
-    
-    _requiresClear = true;
-    _clearColor.set(0.0f,0.0f,0.0f,1.0f);  
-
 }