iio: light: cm36651: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.

Signed-off-by: Cai Huoqing <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/light/cm36651.c

···
 	cm36651 = iio_priv(indio_dev);
 
 	cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
-	if (IS_ERR(cm36651->vled_reg)) {
-		dev_err(&client->dev, "get regulator vled failed\n");
-		return PTR_ERR(cm36651->vled_reg);
-	}
+	if (IS_ERR(cm36651->vled_reg))
+		return dev_err_probe(&client->dev, PTR_ERR(cm36651->vled_reg),
+				     "get regulator vled failed\n");
 
 	ret = regulator_enable(cm36651->vled_reg);
 	if (ret) {