staging:iio:adc:ad799x move to new event handling

Untested.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/ad799x.h

@@ -114,7 +114,6 @@ struct ad799x_state {
 	struct i2c_client		*client;
 	const struct ad799x_chip_info	*chip_info;
 	struct work_struct		poll_work;
-	struct work_struct		work_thresh;
 	atomic_t			protect_ring;
 	size_t				d_size;
 	struct iio_trigger		*trig;