regulator/bq24022: fix bug in is_enabled function

This seems to be fallout from last October's regulator core rework.
It got noticed only because of recent regulator framework changes.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/regulator/bq24022.c b/drivers/regulator/bq24022.c
index 7ecb820..d08cd9b 100644
--- a/drivers/regulator/bq24022.c
+++ b/drivers/regulator/bq24022.c
@@ -61,8 +61,7 @@
 
 static int bq24022_is_enabled(struct regulator_dev *rdev)
 {
-	struct platform_device *pdev = rdev_get_drvdata(rdev);
-	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
 
 	return !gpio_get_value(pdata->gpio_nce);
 }