[ISSUE #8148] Fix variable typo

[oopooa]

Which Issue(s) This PR Fixes

Fixes #8148

Brief Description

variable typo

How Did You Test This Change?

variable typo

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 42.90%. Comparing base (2fdafd2) to head (b8e2f67).

Files	Patch %	Lines
...pache/rocketmq/store/stats/BrokerStatsManager.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8149      +/-   ##
=============================================
- Coverage      42.95%   42.90%   -0.05%     
+ Complexity     10384    10364      -20     
=============================================
  Files           1270     1270              
  Lines          88690    88690              
  Branches       11401    11401              
=============================================
- Hits           38097    38054      -43     
- Misses         45899    45934      +35     
- Partials        4694     4702       +8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.