tty: serial: imx: Add return value check for platform_get_irq()

RX irq is required, so add return value check for platform_get_irq().
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/1589180996-618-1-git-send-email-Anson.Huang@nxp.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/imx.c

@@ -2252,6 +2252,8 @@ static int imx_uart_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	rxirq = platform_get_irq(pdev, 0);
+	if (rxirq < 0)
+		return rxirq;
 	txirq = platform_get_irq_optional(pdev, 1);
 	rtsirq = platform_get_irq_optional(pdev, 2);