iio: core: return ENODEV if ioctl is unknown

When the ioctl() mechanism was introduced in IIO core to centralize the
registration of all ioctls in one place via commit 8dedcc3 ("iio:
core: centralize ioctl() calls to the main chardev"), the return code was
changed from ENODEV to EINVAL, when the ioctl code isn't known.

This was done by accident.

This change reverts back to the old behavior, where if the ioctl() code
isn't known, ENODEV is returned (vs EINVAL).

This was brought into perspective by this patch:
  https://lore.kernel.org/linux-iio/[email protected]/

Fixes: 8dedcc3 ("iio: core: centralize ioctl() calls to the main chardev")
Signed-off-by: Alexandru Ardelean <[email protected]>
Reviewed-by: Nuno Sá <[email protected]>
Tested-by: Paul Cercueil <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

Author: commodo

drivers/iio/industrialio-core.c

@@ -1778,15 +1778,14 @@ static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	if (!indio_dev->info)
 		goto out_unlock;
 
-	ret = -EINVAL;
 	list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) {
 		ret = h->ioctl(indio_dev, filp, cmd, arg);
 		if (ret != IIO_IOCTL_UNHANDLED)
 			break;
 	}
 
 	if (ret == IIO_IOCTL_UNHANDLED)
-		ret = -EINVAL;
+		ret = -ENODEV;
 
 out_unlock:
 	mutex_unlock(&indio_dev->info_exist_lock);