ASoC: samsung: Fix checking return value of clk_get

clk_get() returns a pointer to the struct clk or an ERR_PTR().
This patch also use PTR_ERR() for return value.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/samsung/s3c24xx_uda134x.c b/sound/soc/samsung/s3c24xx_uda134x.c
index dc9d551..65c1cfd 100644
--- a/sound/soc/samsung/s3c24xx_uda134x.c
+++ b/sound/soc/samsung/s3c24xx_uda134x.c
@@ -66,17 +66,17 @@
 	pr_debug("%s %d\n", __func__, clk_users);
 	if (clk_users == 0) {
 		xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
-		if (!xtal) {
+		if (IS_ERR(xtal)) {
 			printk(KERN_ERR "%s cannot get xtal\n", __func__);
-			ret = -EBUSY;
+			ret = PTR_ERR(xtal);
 		} else {
 			pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
 				       "pclk");
-			if (!pclk) {
+			if (IS_ERR(pclk)) {
 				printk(KERN_ERR "%s cannot get pclk\n",
 				       __func__);
 				clk_put(xtal);
-				ret = -EBUSY;
+				ret = PTR_ERR(pclk);
 			}
 		}
 		if (!ret) {