ASoC: simple-card: Fix the sysclk selection.

For spdif there is no need to do the sysclk setting.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 58c217e..d4402fb 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -106,12 +106,8 @@
 				     &dai->sysclk);
 	} else {
 		clk = of_clk_get(*node, 0);
-		if (IS_ERR(clk)) {
-			ret = PTR_ERR(clk);
-			goto parse_error;
-		}
-
-		dai->sysclk = clk_get_rate(clk);
+		if (!IS_ERR(clk))
+			dai->sysclk = clk_get_rate(clk);
 	}
 
 	ret = 0;