fix the warnings for go test --race

[xwjdsh]

Description

As title.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have performed a self-review of my own code
• I have commented my code, ensuring GoDoc readability and clarity in hard-to-understand areas
• I have made corresponding changes to documentation
• I have added tests that ensure my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

If checklist items are unchecked please explain.

[madflojo]

👍 Thanks for catching the errors and opening a PR!