7006997: A typo in MidiSystem.getTransmitter() implementation code

Reviewed-by: dav

src/share/classes/javax/sound/midi/MidiSystem.java

 /*
- * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -310,7 +310,7 @@ public class MidiSystem {
         } else {
             transmitter = device.getTransmitter();
         }
-        if (!(transmitter instanceof MidiDeviceReceiver)) {
+        if (!(transmitter instanceof MidiDeviceTransmitter)) {
             transmitter = new MidiDeviceTransmitterEnvelope(device, transmitter);
         }
         return transmitter;