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>

sound/soc/generic/simple-card.c

@@ -106,11 +106,7 @@ asoc_simple_card_sub_parse_of(struct device_node *np,
 				     &dai->sysclk);
 	} else {
 		clk = of_clk_get(*node, 0);
-		if (IS_ERR(clk)) {
-			ret = PTR_ERR(clk);
-			goto parse_error;
-		}
-
+		if (!IS_ERR(clk))
 			dai->sysclk = clk_get_rate(clk);
 	}