ASoC: wm8731: fix wm8731_check_osc() connected condition

The crystal oscillator is only enabled if the WM8731_SYSCLK_XTAL master clock
is specified. Fix the connected() struct snd_soc_dapm_route function to take
this into account. Oscillator is not enabled on machine that need it otherwise.

Machine drivers have to make sure that they use the proper SYSCLK value.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: NLiam Girdwood <lrg@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8731.c

@@ -198,7 +198,7 @@ static int wm8731_check_osc(struct snd_soc_dapm_widget *source,
 {
 	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(source->codec);
 
-	return wm8731->sysclk_type == WM8731_SYSCLK_MCLK;
+	return wm8731->sysclk_type == WM8731_SYSCLK_XTAL;
 }
 
 static const struct snd_soc_dapm_route wm8731_intercon[] = {