[PATCH -next] tty: of_serial: fix return value check in of_platform_serial_setup()

[Wei Yongjun]

From: Wei Yongjun <yongjun_wei at trendmicro.com.cn>

In case of error, the function clk_get() returns ERR_PTR()
and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
---
 drivers/tty/serial/of_serial.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 533ccfe..b9fdccb 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -66,10 +66,10 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
 
 		/* Get clk rate through clk driver if present */
 		info->clk = clk_get(&ofdev->dev, NULL);
-		if (info->clk == NULL) {
+		if (IS_ERR(info->clk)) {
 			dev_warn(&ofdev->dev,
 				"clk or clock-frequency not defined\n");
-			return -ENODEV;
+			return PTR_ERR(info->clk);
 		}
 
 		clk_prepare_enable(info->clk);