Ignore top level videojs events

@@ -1211,7 +1211,10 @@ test('remove event handlers on dispose', function() {
     oldOn.call(player, type, handler);
   };
   player.off = function(type, handler) {
+    // ignore the top-level videojs removals that aren't relevant to HLS
+    if (type && type !== 'dispose') {
       offhandlers++;
+    }
     oldOff.call(player, type, handler);
   };
   player.src({