[ISSUE #10181] Some minor fixes in PopConsumerService

[lizhimins]

Which Issue(s) This PR Fixes

• Fixes [Enhancement] Some minor fixes in PopConsumerService #10181

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.82%. Comparing base (ebf1595) to head (cf03817).

Files with missing lines	Patch %	Lines
...apache/rocketmq/broker/pop/PopConsumerService.java	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10182      +/-   ##
=============================================
- Coverage      48.94%   48.82%   -0.12%     
+ Complexity     13389    13358      -31     
=============================================
  Files           1373     1373              
  Lines          99924    99924              
  Branches       12908    12908              
=============================================
- Hits           48904    48790     -114     
- Misses         45097    45193      +96     
- Partials        5923     5941      +18     

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[qianye1001]

LGTM

[lollipopjin]

LGTM