[3.0] check ClosedChannelException at close operation

[zrlw]

What is the purpose of the change

#9009

[codecov-commenter]

Codecov Report

Merging #9010 (66b71fc) into 3.0 (23a4ff0) will decrease coverage by 0.01%.
The diff coverage is 16.66%.

@@             Coverage Diff              @@
##                3.0    #9010      +/-   ##
============================================
- Coverage     63.35%   63.34%   -0.02%     
+ Complexity      315      313       -2     
============================================
  Files          1186     1186              
  Lines         50364    50368       +4     
  Branches       7526     7527       +1     
============================================
- Hits          31910    31906       -4     
- Misses        14978    14981       +3     
- Partials       3476     3481       +5     

Impacted Files	Coverage Δ
.../exchange/support/header/HeaderExchangeServer.java	66.36% <16.66%> (-2.51%)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0.00%> (-7.96%)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	68.42% <0.00%> (-5.27%)	⬇️
...ng/zookeeper/curator5/Curator5ZookeeperClient.java	66.50% <0.00%> (-2.43%)	⬇️
.../dubbo/remoting/transport/netty4/NettyChannel.java	63.36% <0.00%> (-1.99%)	⬇️
...ting/zookeeper/curator/CuratorZookeeperClient.java	70.38% <0.00%> (-0.98%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	88.39% <0.00%> (-0.90%)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	80.46% <0.00%> (-0.20%)	⬇️
...pache/dubbo/remoting/transport/AbstractClient.java	62.14% <0.00%> (+1.42%)	⬆️
... and 5 more

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[wangchengming666]

LGTM