fbdev: fsl-diu-fb: add missing device_remove_file()

Call device_remove_file() when driver remove.

Signed-off-by: Shixiong Ou <oushixiong@kylinos.cn>
Signed-off-by: Helge Deller <deller@gmx.de>

Author: Shixiong Ou

drivers/video/fbdev/fsl-diu-fb.c

@@ -1827,6 +1827,7 @@ static void fsl_diu_remove(struct platform_device *pdev)
 	int i;
 
 	data = dev_get_drvdata(&pdev->dev);
+	device_remove_file(&pdev->dev, &data->dev_attr);
 	disable_lcdc(&data->fsl_diu_info[0]);
 
 	free_irq(data->irq, data->diu_reg);