add fireInboundBufferUpdated to fix #1085 socksproxy example

example/src/main/java/io/netty/example/socksproxy/SocksServerHandler.java

@@ -57,6 +57,7 @@ public final class SocksServerHandler extends ChannelInboundMessageHandlerAdapte
                     ctx.pipeline().addLast(SocksServerConnectHandler.getName(), new SocksServerConnectHandler());
                     ctx.pipeline().remove(this);
                     ctx.nextInboundMessageBuffer().add(socksRequest);
+                    ctx.fireInboundBufferUpdated();
                 } else {
                     ctx.close();
                 }