Fix jshint warnings

Remove an unused variable and avoid a global in the tests.

@@ -182,7 +182,6 @@ var
       mediaSource = new videojs.MediaSource(),
       segmentParser = new videojs.hls.SegmentParser(),
       player = this,
-      extname,
       srcUrl,
 
       segmentXhr,

@@ -546,6 +546,7 @@ test('ignores src attribute if it doesn\'t have the "m3u8" extension', function(
 });
 
 test('activates if the first playable source is HLS', function() {
+  var video;
   document.querySelector('#qunit-fixture').innerHTML =
     '<video controls>' +
       '<source type="slartibartfast$%" src="movie.slarti">' +