ARM: pxa: fix return value check in pxa2xx_drv_pcmcia_probe()

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

dpatch engine is used to auto generated this patch.
(https://github.com/weiyj/dpatch)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

drivers/pcmcia/pxa2xx_base.c

@@ -297,7 +297,7 @@ static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
 	}
 
 	clk = clk_get(&dev->dev, NULL);
-	if (!clk)
+	if (IS_ERR(clk))
 		return -ENODEV;
 
 	pxa2xx_drv_pcmcia_ops(ops);