dispose of graphics object to prevent memory leaks

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4892 3789f03b-4d11-0410-bbf8-ca57d06f2519

java/com/tigervnc/vncviewer/DesktopWindow.java

@@ -327,6 +327,7 @@ class DesktopWindow extends JPanel implements
     } else {
       g2.drawImage(im.getImage(), 0, 0, null);
     }
+    g2.dispose();
   }
   
   String oldContents = "";