fix (#10458) doUnregister 递归调用

[liufeiyu1002]

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• [x] 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.
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[codecov-commenter]

Codecov Report

Merging #10464 (7783be0) into 3.1 (551f820) will decrease coverage by 0.09%. The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.1   #10464      +/-   ##
============================================
- Coverage     65.45%   65.36%   -0.10%     
+ Complexity      296      295       -1     
============================================
  Files          1274     1274              
  Lines         54948    54947       -1     
  Branches       8285     8285              
============================================
- Hits          35966    35914      -52     
- Misses        15073    15116      +43     
- Partials       3909     3917       +8     

Impacted Files	Coverage Δ
...gistry/client/ReflectionBasedServiceDiscovery.java	0.00% <ø> (ø)
...bo/rpc/protocol/dubbo/DecodeableRpcInvocation.java	70.19% <0.00%> (-10.58%)	:arrow_down:
.../common/threadpool/serial/SerializingExecutor.java	70.37% <0.00%> (-7.41%)	:arrow_down:
...rg/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java	65.21% <0.00%> (-4.35%)	:arrow_down:
...org/apache/dubbo/rpc/protocol/AbstractInvoker.java	66.97% <0.00%> (-3.67%)	:arrow_down:
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0.00%> (-3.51%)	:arrow_down:
...ubbo/common/url/component/param/DynamicValues.java	78.12% <0.00%> (-3.13%)	:arrow_down:
...ache/dubbo/rpc/protocol/dubbo/DubboCountCodec.java	90.62% <0.00%> (-3.13%)	:arrow_down:
.../apache/dubbo/remoting/transport/CodecSupport.java	80.30% <0.00%> (-3.04%)	:arrow_down:
.../dubbo/registry/client/metadata/MetadataUtils.java	69.15% <0.00%> (-2.81%)	:arrow_down:
... and 14 more

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