backlight: core: Replace kfree with put_device

As per the comments on device_register, we shouldn't call kfree()
right after a device_register() failure. Instead call put_device(),
which in turn will call bl_device_release resulting in a kfree to the
full structure.

Signed-off-by: Levente Kurusa <[e-mail]>
Acked-by: Jingoo Han <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/video/backlight/backlight.c

···
 
 	rc = device_register(&new_bd->dev);
 	if (rc) {
-		kfree(new_bd);
+		put_device(&new_bd->dev);
 		return ERR_PTR(rc);
 	}