staging:iio: iio_trigger contains defunct owner field. Remove it.

This field moved into the trigger_ops structure a while back, but somehow
never quite got cleared up. This clears the last few drivers to set it
(nothing uses it) and gets rid of it entirely.

Signed-off-by: Jonathan Cameron <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/iio/adc/ad7192.c

···
 	disable_irq_nosync(st->spi->irq);
 	st->irq_dis = true;
 	st->trig->dev.parent = &st->spi->dev;
-	st->trig->owner = THIS_MODULE;
 	st->trig->private_data = indio_dev;
 
 	ret = iio_trigger_register(st->trig);

drivers/staging/iio/adc/ad7793.c

···
 	disable_irq_nosync(st->spi->irq);
 	st->irq_dis = true;
 	st->trig->dev.parent = &st->spi->dev;
-	st->trig->owner = THIS_MODULE;
 	st->trig->private_data = indio_dev;
 
 	ret = iio_trigger_register(st->trig);

drivers/staging/iio/trigger.h

···
  * @private_data:	[DRIVER] device specific data
  * @list:		[INTERN] used in maintenance of global trigger list
  * @alloc_list:		[DRIVER] used for driver specific trigger list
- * @owner:		[DRIVER] used to monitor usage count of the trigger.
  * @use_count:		use count for the trigger
  * @subirq_chip:	[INTERN] associate 'virtual' irq chip.
  * @subirq_base:	[INTERN] base number for irqs provided by trigger.
···
 	void				*private_data;
 	struct list_head		list;
 	struct list_head		alloc_list;
-	struct module			*owner;
 	int use_count;
 
 	struct irq_chip			subirq_chip;

drivers/staging/iio/trigger/iio-trig-periodic-rtc.c

···
 			goto error_put_trigger_and_remove_from_list;
 		}
 		trig->private_data = trig_info;
-		trig->owner = THIS_MODULE;
 		trig->ops = &iio_prtc_trigger_ops;
 		/* RTC access */
 		trig_info->rtc