serial: 8250_platform: Don't shadow error from serial8250_register_8250_port()

Don't shadow error from serial8250_register_8250_port() and return it as is.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240812154901.1068407-3-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_platform.c

@@ -150,7 +150,7 @@ static int serial8250_platform_probe(struct platform_device *pdev)
 
 	line = serial8250_register_8250_port(&uart);
 	if (line < 0)
-		return -ENODEV;
+		return line;
 
 	return 0;
 }