Remove unused variable initialization

/home/elsid/dev/openmw/apps/openmw/mwrender/animation.cpp:518:28: warning: Value stored to 'material' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
            osg::Material* material = static_cast<osg::Material*>(stateset->getAttribute(osg::StateAttribute::MATERIAL));
                           ^
/home/elsid/dev/openmw/apps/openmw/mwrender/animation.cpp:518:28: note: Value stored to 'material' during its initialization is never read

apps/openmw/mwrender/animation.cpp

@@ -515,13 +515,11 @@ namespace MWRender
     protected:
         virtual void setDefaults(osg::StateSet* stateset)
         {
-            osg::Material* material = static_cast<osg::Material*>(stateset->getAttribute(osg::StateAttribute::MATERIAL));
-
             osg::BlendFunc* blendfunc (new osg::BlendFunc);
             stateset->setAttributeAndModes(blendfunc, osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE);
 
             // FIXME: overriding diffuse/ambient/emissive colors
-            material = new osg::Material;
+            osg::Material* material = new osg::Material;
             material->setColorMode(osg::Material::OFF);
             material->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4f(1,1,1,mAlpha));
             material->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4f(1,1,1,1));