tty: serial: linflexuart: Fix to check return value of platform_get_i…

…rq() in linflex_probe()

The platform_get_irq might be failed and return a negative result. So
there should have an error handling code.

Fixed this by adding an error handling code.

Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Link: https://lore.kernel.org/r/tencent_234B0AACD06350E10D7548C2E086A9166305@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/fsl_linflexuart.c

@@ -832,10 +832,14 @@ static int linflex_probe(struct platform_device *pdev)
 		return PTR_ERR(sport->membase);
 	sport->mapbase = res->start;
 
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+
 	sport->dev = &pdev->dev;
 	sport->type = PORT_LINFLEXUART;
 	sport->iotype = UPIO_MEM;
-	sport->irq = platform_get_irq(pdev, 0);
+	sport->irq = ret;
 	sport->ops = &linflex_pops;
 	sport->flags = UPF_BOOT_AUTOCONF;
 	sport->has_sysrq = IS_ENABLED(CONFIG_SERIAL_FSL_LINFLEXUART_CONSOLE);