Clean-up jshint issues

Remove unused code and variables.

@@ -442,8 +442,6 @@ Transmuxer = function() {
   // generate an init segment
   this.initSegment = mp4.initSegment();
 
-  aacStream.on('data', function(data) {
-  });
   h264Stream.on('data', function(data) {
     var
       moof = mp4.moof(sequenceNumber, []),

@@ -646,7 +646,7 @@ test('parses an example mp2t file and generates media segments', function() {
   var
     segments = [],
     sequenceNumber = window.Infinity,
-    i, boxes, mfhd, traf, mdat;
+    i, boxes, mfhd, traf;
   transmuxer.on('data', function(segment) {
     segments.push(segment);
   });