fix: fix incorrect nil return value

[huochexizhan]

Proposed changes

Since we have already checked err before and returned != nil, err must be nil here. In fact, it should returnqerr .

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)