armbian-resize-filesystem: fix typo $rootdev → $diskdev in do_expand_partition

[iav]

Typo fix: $rootdev is undefined in do_expand_partition — should be $diskdev.

Fixes #9594

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of automatic reboot scheduling during filesystem resize operations on specific kernel versions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 0e10e1a8-c174-4cc2-9083-ff64581be179

📥 Commits

Reviewing files that changed from the base of the PR and between 3814034 and d76520c.

📒 Files selected for processing (1)

• packages/bsp/common/usr/lib/armbian/armbian-resize-filesystem

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📝 Walkthrough

Walkthrough

A bug fix corrects an undefined variable reference in the do_expand_partition() function. The partprobe call that conditionally triggers a filesystem reboot now references the correct disk device variable instead of an undefined root filesystem device variable.

Changes

Cohort / File(s)	Summary
Bug Fix packages/bsp/common/usr/lib/armbian/armbian-resize-filesystem	Corrected undefined variable reference in partprobe call from $rootdev to $diskdev within do_expand_partition() function.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A variable lost, undefined and forlorn,
But spotted with care on a code review morn,
From rootdev to diskdev, the correction rings true,
One line, one fix, makes the script shine anew! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately identifies the fix as correcting a typo where $rootdev should be $diskdev in the do_expand_partition function.
Linked Issues check	✅ Passed	The pull request directly addresses issue #9594 by changing the undefined $rootdev variable to $diskdev in do_expand_partition, matching the requirement.
Out of Scope Changes check	✅ Passed	The pull request contains only the single variable substitution change needed to fix issue #9594, with no extraneous modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!