Fixed race condition which results in inconsistent error code on missing copyright header.

[vovanec]

Fixed race condition which resulted in inconsistent error code on missing copyright header.

[google-cla]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[vovanec]

@googlebot I signed it!

[vovanec]

Is there ANY ongoing activity for this project? I see a bunch of merge requests opened without any update. If it's not something actively maintained by anybody, I can take over or simply do my own fork. Let me know.

[flwyd]

Thanks for contributing to addlicense! I've picked up ownership after the previous maintainers moved on.

[flwyd]

I think the error paths do a log.Printf already, and it seems weird to print the error to stdout. Is this line needed?