Fix deepsource: RVV-A0003 exit inside non-main function

[vankichi]

Description:

I have fixed the RVV-A0003 reported by deepsource.

Related Issue:

Versions:

• Go Version: 1.19.2
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.14.8

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

Special notes for your reviewer:

[vdaas-ci]

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[codecov]

Codecov Report

Base: 30.53% // Head: 30.48% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (f4ad5e0) compared to base (b36a6c4).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1838      +/-   ##
==========================================
- Coverage   30.53%   30.48%   -0.05%     
==========================================
  Files         367      367              
  Lines       33777    33796      +19     
==========================================
- Hits        10313    10302      -11     
- Misses      23048    23076      +28     
- Partials      416      418       +2     

Impacted Files	Coverage Δ
hack/license/gen/main.go	0.00% <0.00%> (ø)
internal/info/info.go	88.35% <0.00%> (-0.47%)	⬇️
internal/net/grpc/logger/logger.go	75.00% <0.00%> (-6.82%)	⬇️
...nt/core/ngt/service/vqueue/uninserted_index_map.go	68.30% <0.00%> (-4.92%)	⬇️
pkg/agent/core/ngt/service/option.go	89.57% <0.00%> (-1.85%)	⬇️
internal/worker/queue.go	98.73% <0.00%> (-1.27%)	⬇️
internal/errgroup/group.go	94.00% <0.00%> (-1.00%)	⬇️
internal/worker/worker.go	81.53% <0.00%> (-0.77%)	⬇️
...ent/core/ngt/service/vqueue/undeleted_index_map.go	68.33% <0.00%> (+2.22%)	⬆️

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[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	f4ad5e0
Status:	✅  Deploy successful!
Preview URL:	https://2a8a2512.vald.pages.dev
Branch Preview URL:	https://refactor-rvv-a0003-exit-insi.vald.pages.dev

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[hlts2]

LGTM