Fix minor issues not covered by PR #9137

[mswierq]

This PR is a follow up of already merged PR #9137

Delivers minor fixes for nit comments unaddressed in the previous PR

RELEASE NOTES: N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.11%. Comparing base (b58f32d) to head (471ce2f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9147      +/-   ##
==========================================
- Coverage   83.18%   83.11%   -0.07%     
==========================================
  Files         418      418              
  Lines       33709    33710       +1     
==========================================
- Hits        28041    28019      -22     
- Misses       4248     4264      +16     
- Partials     1420     1427       +7     

Files with missing lines	Coverage Δ
balancer/rls/control_channel.go	83.33% <100.00%> (+0.20%)	⬆️

... and 22 files with indirect coverage changes

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