iio: triggers: Make trigger ops structure explicitly non optional.

This structure has not been optional for a long time (if ever) but the
code implies that it is.  As we then use it later in a fashion that would
crash if it was in fact NULL, it's inconsistent so fix it up by removing
unnecessary checks.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/industrialio-trigger.c

@@ -68,6 +68,10 @@ int iio_trigger_register(struct iio_trigger *trig_info)
 {
 	int ret;
 
+	/* trig_info->ops is required for the module member */
+	if (!trig_info->ops)
+		return -EINVAL;
+
 	trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
 	if (trig_info->id < 0)
 		return trig_info->id;
@@ -164,8 +168,7 @@ EXPORT_SYMBOL(iio_trigger_poll_chained);
 
 void iio_trigger_notify_done(struct iio_trigger *trig)
 {
-	if (atomic_dec_and_test(&trig->use_count) && trig->ops &&
-		trig->ops->try_reenable)
+	if (atomic_dec_and_test(&trig->use_count) && trig->ops->try_reenable)
 		if (trig->ops->try_reenable(trig))
 			/* Missed an interrupt so launch new poll now */
 			iio_trigger_poll(trig);
@@ -219,7 +222,7 @@ static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
 		return ret;
 	}
 
-	if (trig->ops && trig->ops->set_trigger_state && notinuse) {
+	if (trig->ops->set_trigger_state && notinuse) {
 		ret = trig->ops->set_trigger_state(trig, true);
 		if (ret < 0)
 			module_put(pf->indio_dev->info->driver_module);
@@ -236,7 +239,7 @@ static int iio_trigger_detach_poll_func(struct iio_trigger *trig,
 		= (bitmap_weight(trig->pool,
 				 CONFIG_IIO_CONSUMERS_PER_TRIGGER)
 		   == 1);
-	if (trig->ops && trig->ops->set_trigger_state && no_other_users) {
+	if (trig->ops->set_trigger_state && no_other_users) {
 		ret = trig->ops->set_trigger_state(trig, false);
 		if (ret)
 			return ret;
@@ -358,7 +361,7 @@ static ssize_t iio_trigger_write_current(struct device *dev,
 			return ret;
 	}
 
-	if (trig && trig->ops && trig->ops->validate_device) {
+	if (trig && trig->ops->validate_device) {
 		ret = trig->ops->validate_device(trig, indio_dev);
 		if (ret)
 			return ret;