Go vet

Author: louisroyer

.github/workflows/main.yml

@@ -26,3 +26,5 @@ jobs:
           run: go get .
         - name: Build
           run: go build -v ./...
+        - name: Lint
+          run: go vet ./...

internal/app/nat4hook.go

@@ -81,7 +81,7 @@ func (hook Nat4Hook) RunExit(ctx context.Context) error {
 	if errcount == 1 {
 		return lasterr
 	} else if errcount > 1 {
-		return fmt.Errorf("%i iptable errors", errcount)
+		return fmt.Errorf("%d iptable errors", errcount)
 	}
 	return nil
 }