staging: iio: max1363 fix bug due to scan_element directory move.

    The device found passed to the attr functions is that of the ring
    buffer, not the the iio_dev so we need to bounce through one more
    hop to get the right address.
Reported-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/max1363_core.c

@@ -151,7 +151,8 @@ static ssize_t max1363_show_precision_u(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
 {
-	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+	struct iio_dev *dev_info = ring->indio_dev;
 	struct max1363_state *st = iio_dev_get_devdata(dev_info);
 	return sprintf(buf, "u%d/16\n", st->chip_info->bits);
 }
@@ -160,7 +161,8 @@ static ssize_t max1363_show_precision_s(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
 {
-	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+	struct iio_dev *dev_info = ring->indio_dev;
 	struct max1363_state *st = iio_dev_get_devdata(dev_info);
 	return sprintf(buf, "s%d/16\n", st->chip_info->bits);
 }