nit avoid unnecessary variable

examples/js/objects/Reflector.js

@@ -172,11 +172,9 @@ THREE.Reflector = function ( geometry, options ) {
 
 		// Restore viewport
 
-		var viewport = camera.viewport;
+		if ( camera.viewport !== undefined ) {
 
-		if ( viewport !== undefined ) {
-
-			renderer.state.viewport( viewport );
+			renderer.state.viewport( camera.viewport );
 
 		}
 

examples/js/objects/Refractor.js

@@ -210,11 +210,9 @@ THREE.Refractor = function ( geometry, options ) {
 
 			// restore viewport
 
-			var viewport = camera.viewport;
+			if ( camera.viewport !== undefined ) {
 
-			if ( viewport !== undefined ) {
-
-				renderer.state.viewport( viewport );
+				renderer.state.viewport( camera.viewport );
 
 			}