move count down to final part to avoid meaningless waiting when exception throw

[tonymarz]

What is the purpose of the change

move count down to final part to avoid meaningless waiting when exception throw

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #8406 (db80bff) into 3.0 (bb94723) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.0    #8406      +/-   ##
============================================
- Coverage     63.20%   63.16%   -0.05%     
- Complexity      311      312       +1     
============================================
  Files          1099     1099              
  Lines         46057    46057              
  Branches       6955     6955              
============================================
- Hits          29112    29093      -19     
- Misses        13693    13712      +19     
  Partials       3252     3252              

Impacted Files	Coverage Δ
...gistry/client/migration/MigrationRuleListener.java	72.27% <100.00%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	82.75% <0.00%> (-6.90%)	⬇️
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0.00%> (-5.27%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	89.47% <0.00%> (-4.39%)	⬇️
.../remoting/transport/netty4/NettyClientHandler.java	64.40% <0.00%> (-3.39%)	⬇️
...exchange/support/header/HeaderExchangeHandler.java	61.06% <0.00%> (-2.66%)	⬇️
...java/org/apache/dubbo/remoting/api/Connection.java	76.59% <0.00%> (-2.13%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	78.10% <0.00%> (-1.46%)	⬇️
.../src/main/java/org/apache/dubbo/rpc/RpcStatus.java	72.61% <0.00%> (-1.20%)	⬇️
...ting/zookeeper/curator/CuratorZookeeperClient.java	67.48% <0.00%> (-0.99%)	⬇️
... and 7 more

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[xiaoheng1]

LGTM