staging:iio:fix using iio_priv or iio_dev after iio_unregister_device
This includes calling iio_free_device as that should only be called before the device has been registered. Also one case of iio_free_device being called on a registered device. This has been pulled out of the reworking attributes patch. Signed-off-by: NJonathan Cameron <jic23@cam.ac.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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