Fixed issue: NETTY-164 - ReplayingDecoderBuffer.readableBytes() and capacity() should not return Integer.MAX_VALUE if the connection is closed.

* Fixed a problem where ReplayingDecoderBuffer.readable() does not respect 'terminated' flag.

src/main/java/org/jboss/netty/handler/codec/replay/ReplayingDecoderBuffer.java

@@ -215,7 +215,7 @@ class ReplayingDecoderBuffer implements ChannelBuffer {
     }
 
     public boolean readable() {
-        return true;
+        return terminated? buffer.readable() : true;
     }
 
     public int readableBytes() {