leds: pwm-multicolor: Simplify an error message

dev_err_probe() already display the error code. There is no need to
duplicate it explicitly in the error message.

While at it, add a missing \n at the end of the message.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/07d35e221faaa380fd11cd4597e42354c8eb350c.1681576017.git.christophe.jaillet@wanadoo.fr

drivers/leds/rgb/leds-pwm-multicolor.c

@@ -158,8 +158,8 @@ static int led_pwm_mc_probe(struct platform_device *pdev)
 	ret = led_pwm_mc_set(cdev, cdev->brightness);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret,
-				     "failed to set led PWM value for %s: %d",
-				     cdev->name, ret);
+				     "failed to set led PWM value for %s\n",
+				     cdev->name);
 
 	platform_set_drvdata(pdev, priv);
 	return 0;