[PATCH -next] serial: xilinx_uartps: fix return value check in xuartps_probe()

[Wei Yongjun]

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

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

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

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 2be22a2..1eb4657 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -948,9 +948,9 @@ static int xuartps_probe(struct platform_device *pdev)
 	struct clk *clk;
 
 	clk = of_clk_get(pdev->dev.of_node, 0);
-	if (!clk) {
+	if (IS_ERR(clk)) {
 		dev_err(&pdev->dev, "no clock specified\n");
-		return -ENODEV;
+		return PTR_ERR(clk);
 	}
 
 	rc = clk_prepare_enable(clk);