Enable staticcheck Linter

[tri-adam]

Description of the Pull Request (PR):

Enable staticcheck linter, and address associated lint.

This fixes or addresses the following GitHub issues:

• N/A

Before submitting a PR, make sure you have done the following:

• Read the Guidelines for Contributing, and this PR conforms to the stated requirements.
• Added changes to the CHANGELOG if necessary according to the Contribution Guidelines
• Added tests to validate this PR, linted with make check and tested this PR locally with a make test, and make testall if possible (see CONTRIBUTING.md).
• Based this PR against the appropriate branch according to the Contribution Guidelines
• Added myself as a contributor to the Contributors File

[dtrudg]

All looks sensible to me