improve the code that DubboProtocol.java#getClients

[zhongxiongzeng]

What is the purpose of the change

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 #7885 (c935fc7) into master (d6d8d25) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #7885      +/-   ##
============================================
- Coverage     59.64%   59.63%   -0.01%     
+ Complexity      556      555       -1     
============================================
  Files          1088     1088              
  Lines         43847    43850       +3     
  Branches       6400     6403       +3     
============================================
- Hits          26153    26152       -1     
- Misses        14777    14786       +9     
+ Partials       2917     2912       -5     

Impacted Files	Coverage Δ
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	64.87% <100.00%> (-0.62%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	80.34% <0.00%> (-11.12%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	35.52% <0.00%> (-10.53%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	82.75% <0.00%> (-6.90%)	⬇️
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	79.72% <0.00%> (-0.69%)	⬇️
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.61% <0.00%> (-0.40%)	⬇️
...apache/dubbo/common/constants/CommonConstants.java	100.00% <0.00%> (ø)
...apache/dubbo/common/extension/ExtensionLoader.java	81.59% <0.00%> (+0.22%)	⬆️
...n/java/org/apache/dubbo/common/utils/NetUtils.java	68.43% <0.00%> (+1.88%)	⬆️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	88.57% <0.00%> (+1.90%)	⬆️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d6d8d25...c935fc7. Read the comment docs.

[BurningCN]

LGMT