serial: 8250_lpss: copy dma_param using devm_kmemdup()

Use devm_kmemdup() helper to copy dma_param instead of doing it manually.
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20240102055006.27256-1-raag.jadav@intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_lpss.c

@@ -287,17 +287,14 @@ static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port
 		return 0;
 	}
 
-	rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
+	rx_param = devm_kmemdup(dev, &lpss->dma_param, sizeof(*rx_param), GFP_KERNEL);
 	if (!rx_param)
 		return -ENOMEM;
 
-	tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL);
+	tx_param = devm_kmemdup(dev, &lpss->dma_param, sizeof(*tx_param), GFP_KERNEL);
 	if (!tx_param)
 		return -ENOMEM;
 
-	*rx_param = lpss->dma_param;
-	*tx_param = lpss->dma_param;
-
 	dma->fn = lpss8250_dma_filter;
 	dma->rx_param = rx_param;
 	dma->tx_param = tx_param;