JSONLoader: code clean up.

src/loaders/JSONLoader.js

@@ -453,11 +453,11 @@ THREE.JSONLoader.prototype.parse = function ( json, texturePath ) {
 
 		geometry.bones = json.bones;
 
-		if ( (geometry.bones.length > 0) && (
-			(geometry.skinWeights.length != geometry.skinIndices.length) ||
-			(geometry.skinIndices.length != geometry.vertices.length) ) ) {
-				console.warn('When skinning, number of vertices (' + geometry.vertices.length + '), skinIndices (' +
-					geometry.skinIndices.length + '), and skinWeights (' + geometry.skinWeights.length + ') should match.');
+		if ( geometry.bones.length > 0 && ( geometry.skinWeights.length !== geometry.skinIndices.length || geometry.skinIndices.length !== geometry.vertices.length ) ) {
+
+				console.warn( 'When skinning, number of vertices (' + geometry.vertices.length + '), skinIndices (' +
+					geometry.skinIndices.length + '), and skinWeights (' + geometry.skinWeights.length + ') should match.' );
+
 		}