[ISSUE apache#8061] Fix npe in netty remoting client (apache#8064)

remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java

@@ -631,7 +631,7 @@ private Channel getAndCreateChannel(final String addr) throws InterruptedExcepti
         if (channelFuture == null) {
             return null;
         }
-        return getAndCreateChannelAsync(addr).awaitUninterruptibly().channel();
+        return channelFuture.awaitUninterruptibly().channel();
     }
 
     private ChannelFuture getAndCreateNameserverChannelAsync() throws InterruptedException {