enhance: [Cherry-pick] Remove duplicated err check code (#32001)

[congqixia]

Cherry-pick from master
pr: #32001

The err != nil check is duplicated here and shall be removed

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.42%. Comparing base (4c07304) to head (d6abaf0).
Report is 8 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #32079      +/-   ##
==========================================
+ Coverage   81.33%   81.42%   +0.08%     
==========================================
  Files         975      975              
  Lines      119650   119655       +5     
==========================================
+ Hits        97316    97425     +109     
+ Misses      18582    18478     -104     
  Partials     3752     3752              

Files	Coverage Δ
internal/proxy/impl.go	86.11% <78.57%> (-0.01%)	⬇️

... and 32 files with indirect coverage changes

[mergify]

@congqixia E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[congqixia]

/run-cpu-e2e

[weiliu1031]

/lgtm