iio: st_lsm9ds0: 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 <caihuoqing@baidu.com>
Link: https://lore.kernel.org/r/20210928014055.1431-2-caihuoqing@baidu.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c

@@ -24,10 +24,10 @@ static int st_lsm9ds0_power_enable(struct device *dev, struct st_lsm9ds0 *lsm9ds
 
 	/* Regulators not mandatory, but if requested we should enable them. */
 	lsm9ds0->vdd = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(lsm9ds0->vdd)) {
-		dev_err(dev, "unable to get Vdd supply\n");
-		return PTR_ERR(lsm9ds0->vdd);
-	}
+	if (IS_ERR(lsm9ds0->vdd))
+		return dev_err_probe(dev, PTR_ERR(lsm9ds0->vdd),
+				     "unable to get Vdd supply\n");
+
 	ret = regulator_enable(lsm9ds0->vdd);
 	if (ret) {
 		dev_warn(dev, "Failed to enable specified Vdd supply\n");
@@ -36,9 +36,9 @@ static int st_lsm9ds0_power_enable(struct device *dev, struct st_lsm9ds0 *lsm9ds
 
 	lsm9ds0->vdd_io = devm_regulator_get(dev, "vddio");
 	if (IS_ERR(lsm9ds0->vdd_io)) {
-		dev_err(dev, "unable to get Vdd_IO supply\n");
 		regulator_disable(lsm9ds0->vdd);
-		return PTR_ERR(lsm9ds0->vdd_io);
+		return dev_err_probe(dev, PTR_ERR(lsm9ds0->vdd_io),
+				     "unable to get Vdd_IO supply\n");
 	}
 	ret = regulator_enable(lsm9ds0->vdd_io);
 	if (ret) {