media: ov5640: add error trace in case of i2c read failure

Add an error trace in ov5640_read_reg() in case of i2c_transfer()
failure.
Uniformize error traces using dev_err instead v4l2_err.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/ov5640.c

@@ -839,7 +839,7 @@ static int ov5640_write_reg(struct ov5640_dev *sensor, u16 reg, u8 val)
 
 	ret = i2c_transfer(client->adapter, &msg, 1);
 	if (ret < 0) {
-		v4l2_err(&sensor->sd, "%s: error: reg=%x, val=%x\n",
+		dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
 			__func__, reg, val);
 		return ret;
 	}
@@ -868,8 +868,11 @@ static int ov5640_read_reg(struct ov5640_dev *sensor, u16 reg, u8 *val)
 	msg[1].len = 1;
 
 	ret = i2c_transfer(client->adapter, msg, 2);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: error: reg=%x\n",
+			__func__, reg);
 		return ret;
+	}
 
 	*val = buf[0];
 	return 0;