wm97xx_batery: replace driver_data with dev_get_drvdata()

direct access of driver_data is going away.

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/power/wm97xx_battery.c b/drivers/power/wm97xx_battery.c
index 8bde921..b787335 100644
--- a/drivers/power/wm97xx_battery.c
+++ b/drivers/power/wm97xx_battery.c
@@ -33,14 +33,14 @@
 
 static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
 {
-	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
+	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
 					pdata->batt_aux) * pdata->batt_mult /
 					pdata->batt_div;
 }
 
 static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
 {
-	return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
+	return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
 					pdata->temp_aux) * pdata->temp_mult /
 					pdata->temp_div;
 }