Fix unused import error in nightly musl clippy exhaustive check

[Copilot]

Fix unused import error in nightly musl clippy exhaustive check

• Identified the issue: unused import on line 664 of initialized_multi_use.rs
• Analyzed the problem: redundant local import of ErrorCode within a test function
• Removed the redundant local import (ErrorCode is already imported at module level on line 31)
• Verified the fix locally with clippy (tested with multiple feature combinations)
• Rebased onto latest main
• Verified with just target-triple=x86_64-unknown-linux-musl like-ci debug - all clippy checks passed

Summary

Fixed the nightly musl clippy failure by removing a redundant local import of ErrorCode in the test_violate_seccomp_filters test function. The import was already available at module level (line 31), making the local import on line 664 unnecessary. When the seccomp feature is disabled (as in musl target tests), this local import becomes unused and causes clippy to fail with -D warnings.

The fix has been verified with multiple feature combinations including the full clippy-exhaustive check with musl target.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Nightly musl Failure - 9</issue_title>
<issue_description>## Job Failure Report

Date: 2025-10-09 00:37:02 UTC
Workflow Run: https://github.com/hyperlight-dev/hyperlight/actions/runs/18361523373

Details

The scheduled job failed during execution. This issue was automatically created to track the failure. Please check the workflow logs and any uploaded artifacts for more details.

Next Steps

• Review the workflow logs for error details
• Download and analyze any crash artifacts if available
• Determine the root cause of the failure
• Fix the underlying issue

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This issue was automatically created by the CI failure notification system.</issue_description>

Comments on the Issue (you are @copilot in this section)

@jsturtevant Looks like a clippy issue

|
664 |         use hyperlight_common::flatbuffer_wrappers::guest_error::ErrorCode;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D unused-imports` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(unused_imports)]`

error: could not compile `hyperlight-host` (lib test) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: Recipe `clippy-exhaustive` failed on line 271 with exit code 101
Error
```</body></comment_new>
</comments>

Fixes #947

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[jsturtevant]

@copilot rebase and run just target-triple=x86_64-unknown-linux-musl like-ci debug to verify

[Copilot]

@copilot rebase and run just target-triple=x86_64-unknown-linux-musl like-ci debug to verify

Rebased onto latest main (036d3ae) and verified with just target-triple=x86_64-unknown-linux-musl like-ci debug. All clippy checks passed successfully, including the clippy-exhaustive check that was failing before.

The test failures are expected due to missing hypervisor in the sandboxed environment ("No Hypervisor was found for Sandbox"), but the critical clippy verification completed successfully with the fix.

Commit: 78427ba

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[jsturtevant]

I ran the tests locally for musl build and they are passing