Avoid unlock twice when io_setup failed

[ucasfl]

• [ ] Does this PR have a descriptive title that could go in our release notes?
• [ ] Does this PR add any new dependencies?
• [ ] Does this PR modify any existing APIs?
  • [ ] Is the change to the API backwards compatible?
• [ ] Should this result in any changes to our documentation, either updating existing docs or adding new ones?

Reference Issues/PRs

What does this implement/fix? Briefly explain your changes.

Fix unlock twice when io_setup failed.

Any other comments?

[ucasfl]

@daxpryce Hi, please take a look. Thanks!