[PATCH v3 2/2] iio: light: cm3323: use dev_err_probe() in probe path

[Aldo Conte <aldocontelk@gmail.com>]

Replace dev_err() calls with dev_err_probe() in cm3323_init() and
cm3323_probe(). cm3323_init() is called by cm3323_probe(),  so using
dev_err_probe() ensures that deferred probing is handled
correctly and simplifies error paths.

Remove the redundant error message in cm3323_probe().

Tested on a Raspberry Pi 3B using i2c-stub. The driver probes
successfully and successfully read integration_time after this change.

Suggested-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Aldo Conte <aldocontelk@gmail.com>
---
Changes in v3:
- Remove extra blank line after cm3323_init() error path
  in cm3323_probe()
  
Changes in v2:
- Add struct device *dev local variable to shorten dev_err_probe()
  calls to one-liners (suggested by Andy Shevchenko)
  
 drivers/iio/light/cm3323.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/light/cm3323.c b/drivers/iio/light/cm3323.c
index 0fe61b8a7029..c8112685e415 100644
--- a/drivers/iio/light/cm3323.c
+++ b/drivers/iio/light/cm3323.c
@@ -80,22 +80,19 @@ static int cm3323_init(struct iio_dev *indio_dev)
 {
 	int ret;
 	struct cm3323_data *data = iio_priv(indio_dev);
+	struct device *dev = &data->client->dev;
 
 	ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF);
-	if (ret < 0) {
-		dev_err(&data->client->dev, "Error reading reg_conf\n");
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Error reading reg_conf\n");
 
 	/* enable sensor and set auto force mode */
 	ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT);
 	data->reg_conf = ret;
 
 	ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, data->reg_conf);
-	if (ret < 0) {
-		dev_err(&data->client->dev, "Error writing reg_conf\n");
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Error writing reg_conf\n");
 
 	return 0;
 }
@@ -236,10 +233,8 @@ static int cm3323_probe(struct i2c_client *client)
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	ret = cm3323_init(indio_dev);
-	if (ret < 0) {
-		dev_err(&client->dev, "cm3323 chip init failed\n");
+	if (ret < 0)
 		return ret;
-	}
 
 	ret = devm_add_action_or_reset(&client->dev, cm3323_disable, indio_dev);
 	if (ret < 0)
-- 
2.53.0