**What type of PR is this?**
Tooling
**What does the PR do?**
Every call to `httputil.HandleError` must be followed by a `return`
statement. It's easy to miss this during reviews, so having a static
analyzer that enforces this will make our life easier.
**Acknowledgements**
- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description with sufficient context for reviewers
to understand this PR.
- [x] I have tested that my changes work as expected and I added a
testing plan to the PR description (if applicable).
---------
Co-authored-by: james-prysm <90280386+james-prysm@users.noreply.github.com>
