chore: fix issues reported by `go vet` #8243

Job	Run time
Run Main (autocounterd) / Go Build / generated	20s
Run Main (autocounterd) / Go Linter / lint	27s
Run Main (autocounterd) / Go Test / test	36s
Run Main (docker-integration) / Go Build / generated	6s
Run Main (docker-integration) / Go Linter / lint	9s
Run Main (docker-integration) / Go Test / test	14s
Run Main (genproto) / Go Build / generated	10s
Run Main (genproto) / Go Linter / lint	44s
Run Main (genproto) / Go Test / test	37s
Run Main (genstd) / Go Build / generated	9s
Run Main (genstd) / Go Linter / lint	17s
Run Main (genstd) / Go Test / test	24s
Run Main (goscan) / Go Build / generated	6s
Run Main (goscan) / Go Linter / lint	17s
Run Main (goscan) / Go Test / test	25s
Run Main (logos) / Go Build / generated	6s
Run Main (logos) / Go Linter / lint	39s
Run Main (logos) / Go Test / test	47s
Run Main (loop) / Go Linter / lint	34s
Run Main (loop) / Go Build / generated	9s
Run Main (loop) / Go Test / test	45s
	8m 1s

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