repeatedly assignment .  or not ?

repeatedly assignment for  eventBus .

``` javascript
function initialize() {
        var $input = $(this),
            deferreds,
            eventBus = new EventBus({ el: $input }); // *******

        deferreds = utils.map(datasets, function(dataset) {
          return dataset.initialize();
        });

        $input.data(viewKey, new TypeaheadView({
          input: $input,
          eventBus: eventBus = new EventBus({ el: $input }), //******
          datasets: datasets
        }));

       //.....
      }
```