serial: liteuart: Remove a copy of UART id in private structure

The struct liteuart_port keeps tracking of UART ID which is also
saved in the struct uart_port as line member. Drop the former one
and use the latter everywhere.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Gabriel Somlo <gsomlo@gmail.com>
Link: https://lore.kernel.org/r/20230123192604.81452-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/liteuart.c

@@ -46,7 +46,6 @@
 struct liteuart_port {
 	struct uart_port port;
 	struct timer_list timer;
-	u32 id;
 	u8 irq_reg;
 };
 
@@ -314,7 +313,6 @@ static int liteuart_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	uart->id = dev_id;
 	/* values not from device tree */
 	port->dev = &pdev->dev;
 	port->iotype = UPIO_MEM;
@@ -334,7 +332,7 @@ static int liteuart_probe(struct platform_device *pdev)
 	return 0;
 
 err_erase_id:
-	xa_erase(&liteuart_array, uart->id);
+	xa_erase(&liteuart_array, dev_id);
 
 	return ret;
 }
@@ -342,10 +340,10 @@ static int liteuart_probe(struct platform_device *pdev)
 static int liteuart_remove(struct platform_device *pdev)
 {
 	struct uart_port *port = platform_get_drvdata(pdev);
-	struct liteuart_port *uart = to_liteuart_port(port);
+	unsigned int line = port->line;
 
 	uart_remove_one_port(&liteuart_driver, port);
-	xa_erase(&liteuart_array, uart->id);
+	xa_erase(&liteuart_array, line);
 
 	return 0;
 }