Fixed a bug where DefaultChannelFuture.isSuccess() returns true even if the future is not done yet

src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java

@@ -80,7 +80,7 @@ public class DefaultChannelFuture implements ChannelFuture {
     }
 
     public synchronized boolean isSuccess() {
-        return cause == null;
+        return done && cause == null;
     }
 
     public synchronized Throwable getCause() {