power: tps65910: replace error() by pr_err()

The patch replaces the former error() by the new pr_err().
This makes the TPS65910 driver conform to Masahiro's patch
'treewide:replace with error() with pr_err()' introduced
October 2017.
Signed-off-by: NFelix Brack <fb@ltec.ch>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/power/pmic/pmic_tps65910_dm.c

@@ -32,7 +32,7 @@ static int pmic_tps65910_write(struct udevice *dev, uint reg, const u8 *buffer,
 
 	ret = dm_i2c_write(dev, reg, buffer, len);
 	if (ret)
-		error("%s write error on register %02x\n", dev->name, reg);
+		pr_err("%s write error on register %02x\n", dev->name, reg);
 
 	return ret;
 }
@@ -44,7 +44,7 @@ static int pmic_tps65910_read(struct udevice *dev, uint reg, u8 *buffer,
 
 	ret = dm_i2c_read(dev, reg, buffer, len);
 	if (ret)
-		error("%s read error on register %02x\n", dev->name, reg);
+		pr_err("%s read error on register %02x\n", dev->name, reg);
 
 	return ret;
 }

drivers/power/regulator/tps65910_regulator.c

@@ -340,11 +340,11 @@ static int buck_set_vdd1_vdd2_value(struct udevice *dev, int uV)
 
 	/* check setpoint is within limits */
 	if (uV < uc_pdata->min_uV) {
-		error("voltage %duV for %s too low\n", uV, dev->name);
+		pr_err("voltage %duV for %s too low\n", uV, dev->name);
 		return -EINVAL;
 	}
 	if (uV > uc_pdata->max_uV) {
-		error("voltage %duV for %s too high\n", uV, dev->name);
+		pr_err("voltage %duV for %s too high\n", uV, dev->name);
 		return -EINVAL;
 	}