tty: serial: samsung_tty: remove set but not used variables

The value of 'ret' is not used which reported by svace, so just return
instead of break.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Link: https://lore.kernel.org/r/1619484575-26098-1-git-send-email-tiantao6@hisilicon.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/samsung_tty.c

@@ -2220,8 +2220,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 			default:
 				dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
 						prop);
-				ret = -EINVAL;
-				break;
+				return -EINVAL;
 			}
 		}
 	}