fixes coverity-ci warning

components/nifosg/particle.cpp

@@ -70,8 +70,6 @@ void ParticleSystem::drawImplementation(osg::RenderInfo& renderInfo) const
 
 void InverseWorldMatrix::operator()(osg::MatrixTransform *node, osg::NodeVisitor *nv)
 {
-    if (nv && nv->getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR)
-    {
     osg::NodePath path = nv->getNodePath();
     path.pop_back();
 
@@ -79,7 +77,7 @@ void InverseWorldMatrix::operator()(osg::MatrixTransform *node, osg::NodeVisitor
     mat.orthoNormalize(mat); // don't undo the scale
     mat.invert(mat);
     node->setMatrix(mat);
-    }
+
     traverse(node,nv);
 }