lint: Fix `fmt.Errorf` guard
Created by: efritz
I forgot to enable forbidigo when I added it to the golangci-lint config
Dry-run: https://buildkite.com/sourcegraph/sourcegraph/builds/128941
Created by: efritz
I forgot to enable forbidigo when I added it to the golangci-lint config
Dry-run: https://buildkite.com/sourcegraph/sourcegraph/builds/128941