GLTFLoader: Simplify code.

Author: Mugen87

examples/jsm/loaders/GLTFLoader.js

@@ -2906,10 +2906,10 @@ class GLTFParser {
 
 			return this.sourceCache[ sourceIndex ].then( function ( texture ) {
 
-				const clonedTexture = texture.clone();
-				clonedTexture.needsUpdate = true;
+				texture = texture.clone();
+				texture.needsUpdate = true;
 
-				return clonedTexture;
+				return texture;
 
 			} ).catch( function ( error ) {