uio: clean uioinfo when uninstall uio driver

The uioinfo should be cleaned up when uninstall, otherwise re-install
failure of uio_pdrv_genirq.ko will happen.

Signed-off-by: Jie Zhou <[e-mail]>
Signed-off-by: Aisheng Dong <[e-mail]>
Signed-off-by: Hans J. Koch <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/uio/uio_pdrv_genirq.c

···
 
 	uio_unregister_device(priv->uioinfo);
 	pm_runtime_disable(&pdev->dev);
+
+	priv->uioinfo->handler = NULL;
+	priv->uioinfo->irqcontrol = NULL;
+
 	kfree(priv);
 	return 0;
 }