bugfix add nil check for grpc connection pool objects in grpc/client.go

[kpango]

Signed-off-by: kpango [email protected]

Description:

add nill checking for grpc connection pool object

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.2
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.1

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

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[codecov]

Codecov Report

Merging #921 (8a99fc6) into master (96d70d2) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
- Coverage   16.23%   16.21%   -0.02%     
==========================================
  Files         473      473              
  Lines       23174    23219      +45     
==========================================
+ Hits         3763     3766       +3     
- Misses      19169    19211      +42     
  Partials      242      242              

Impacted Files	Coverage Δ
internal/net/grpc/addrs.go	0.00% <0.00%> (ø)
internal/net/grpc/client.go	0.00% <0.00%> (ø)
internal/net/grpc/pool/pool.go	0.00% <0.00%> (ø)
pkg/gateway/lb/usecase/vald.go	0.00% <ø> (ø)
internal/errgroup/group.go	92.42% <0.00%> (-1.52%)	⬇️
internal/worker/worker.go	83.33% <0.00%> (+1.04%)	⬆️
internal/worker/queue.go	100.00% <0.00%> (+5.00%)	⬆️

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[github-actions]

[golangci] _{reported by reviewdog 🐶}
ineffectual assignment to reconnLimitDuration (ineffassign)