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MT7921 mt7921_pci_remove crashes

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Sorry if this brings you the inconvenience. I am not familiar to mailing.

The issue is reported at: https://github.com/QubesOS/qubes-issues/issues/7294

`mt7921_pci_remove` seems to always crash whenever it is called. I have read the kernel source code and have a guess.

```
static void mt7921_pci_remove(struct pci_dev *pdev)
{
	struct mt76_dev *mdev = pci_get_drvdata(pdev);
	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);

	mt7921e_unregister_device(dev);
	devm_free_irq(&pdev->dev, pdev->irq, dev);
	pci_free_irq_vectors(pdev);
}
```


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