nit: kill empty line

Author: slandelle

client/src/main/java/org/asynchttpclient/netty/channel/ChannelManager.java

@@ -367,7 +367,6 @@ public void close() {
     }
 
     public void closeChannel(Channel channel) {
-
         LOGGER.debug("Closing Channel {} ", channel);
         Channels.setDiscard(channel);
         removeAll(channel);