[TASK] CGL - Optimize returns and unnecessary math

lib/map/labelslayer.js

@@ -73,7 +73,7 @@ define(["leaflet", "rbush"],
       return [x, y, x + width, y + height];
     }
 
-    var c = L.TileLayer.Canvas.extend({
+    return L.TileLayer.Canvas.extend({
       onAdd: function (map) {
         L.TileLayer.Canvas.prototype.onAdd.call(this, map);
         if (this.data) {
@@ -235,6 +235,4 @@ define(["leaflet", "rbush"],
         }).forEach(drawLabel);
       }
     });
-
-    return c;
   });