extcon: adc-jack: Use the internal data instead of using struct extcon_dev

This patch uses the internal dev instance instead of using the field of struct
extcon_dev because the core structure (extcon_dev) of extcon have to be touched
by only extcon core driver.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index bc53870..6f6537a 100644
--- a/drivers/extcon/extcon-adc-jack.c
+++ b/drivers/extcon/extcon-adc-jack.c
@@ -67,7 +67,7 @@
 
 	ret = iio_read_channel_raw(data->chan, &adc_val);
 	if (ret < 0) {
-		dev_err(&data->edev->dev, "read channel() error: %d\n", ret);
+		dev_err(data->dev, "read channel() error: %d\n", ret);
 		return;
 	}