hwmon: (pmbus) Use dev_err_probe() to filter -EPROBE_DEFER error messages

devm_regulator_register() can return -EPROBE_DEFER, so better use
dev_err_probe() instead of dev_err(), it is less verbose in such a case.

It is also more informative, which can't hurt.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/3adf1cea6e32e54c0f71f4604b4e98d992beaa71.1660741419.git.christophe.jaillet@wanadoo.frSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/pmbus_core.c

@@ -3016,11 +3016,10 @@ static int pmbus_regulator_register(struct pmbus_data *data)
 
 		rdev = devm_regulator_register(dev, &info->reg_desc[i],
 					       &config);
-		if (IS_ERR(rdev)) {
-			dev_err(dev, "Failed to register %s regulator\n",
-				info->reg_desc[i].name);
-			return PTR_ERR(rdev);
-		}
+		if (IS_ERR(rdev))
+			return dev_err_probe(dev, PTR_ERR(rdev),
+					     "Failed to register %s regulator\n",
+					     info->reg_desc[i].name);
 	}
 
 	return 0;