PlatformPlayer: Close midi sequencer if the stream wasn't opened

Since we will manually try to load streams without an explicit type
as one of the supported formats, opening a midi stream is now far
more likely to fail, so account for that and close the Sequencer
whenever that is the case.

src/org/recompile/mobile/PlatformPlayer.java

@@ -256,7 +256,11 @@ public midiPlayer(InputStream stream)
 				midi.setSequence(stream);
 				state = Player.PREFETCHED;
 			}
-			catch (Exception e) { System.out.println("Couldn't load MIDI file: " + e.getMessage()); }
+			catch (Exception e) 
+			{ 
+				System.out.println("Couldn't load MIDI file: " + e.getMessage());
+				midi.close();
+			}
 		}
 
 		public void start()