serial: Fix using plain integer instead of Null pointer

Fix build warning that using plain integer as Null pointer.
This is reported by kbuild test robot.

Fixes: ba44dc043004 ("serial: Add Milbeaut serial control")
Signed-off-by: Sugaya Taichi <sugaya.taichi@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c
index d303b7d4bb20c6a4df907ac04c3f5f21ed91271b..4a10604211bec12debef2ff58e8ef1240e1563a2 100644 (file)
--- a/drivers/tty/serial/milbeaut_usio.c
+++ b/drivers/tty/serial/milbeaut_usio.c
@@ -500,7 +500,7 @@ static struct  uart_driver mlb_usio_uart_driver = {
 
 static int mlb_usio_probe(struct platform_device *pdev)
 {
-       struct clk *clk = devm_clk_get(&pdev->dev, 0);
+       struct clk *clk = devm_clk_get(&pdev->dev, NULL);
        struct uart_port *port;
        struct resource *res;
        int index = 0;