Removed unneccessary return statements

src/CartItem.php

@@ -377,15 +377,11 @@ class CartItem implements Arrayable, Jsonable
                     return with(new $this->associatedModel())->find($this->id);
                 }
 
-                return;
-
             case 'modelFQCN':
                 if (isset($this->associatedModel)) {
                     return $this->associatedModel;
                 }
 
-                return;
-
             default:
                 return;
         }