iio_trigger unregistration and freeing has been separated in this
code for some time, but it looks like the calls to the device
handling were not appropriately updated.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Reported-by: NOtavio Salvador <otavio@ossystems.com.br>
Tested-by: NOtavio Salvador <otavio@ossystems.com.br>
Reviewed-by: NLars-Peter Clausen <lars@metafoo.de>