fix memory leak

[icodening]

What is the purpose of the change

fix memory leak

Brief changelog

#12339

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.

[AlbumenJ]

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #12805 (1a5746b) into 3.2 (96fb4e8) will decrease coverage by 0.50%.
Report is 76 commits behind head on 3.2.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #12805      +/-   ##
============================================
- Coverage     69.95%   69.45%   -0.50%     
+ Complexity      316        2     -314     
============================================
  Files          1852     1646     -206     
  Lines         97786    68314   -29472     
  Branches      17868     9976    -7892     
============================================
- Hits          68408    47449   -20959     
+ Misses        23893    16289    -7604     
+ Partials       5485     4576     -909     

see 3498 files with indirect coverage changes

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[EarthChen]

LGTM