iio: afe4404: Remove no-op trigger ops

The IIO core handles a trigger ops with all NULL callbacks the
same as if the trigger ops itself was NULL.

Remove the empty trigger ops from the interrupt trigger driver to slightly
reduce the boilerplate code. Object size of the driver module is also
slightly reduced.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211031142130.20791-5-lars@metafoo.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/health/afe4404.c

@@ -347,9 +347,6 @@ static irqreturn_t afe4404_trigger_handler(int irq, void *private)
 	return IRQ_HANDLED;
 }
 
-static const struct iio_trigger_ops afe4404_trigger_ops = {
-};
-
 /* Default timings from data-sheet */
 #define AFE4404_TIMING_PAIRS			\
 	{ AFE440X_PRPCOUNT,	39999	},	\
@@ -537,8 +534,6 @@ static int afe4404_probe(struct i2c_client *client,
 
 		iio_trigger_set_drvdata(afe->trig, indio_dev);
 
-		afe->trig->ops = &afe4404_trigger_ops;
-
 		ret = iio_trigger_register(afe->trig);
 		if (ret) {
 			dev_err(afe->dev, "Unable to register IIO trigger\n");