ASoC: rt5670: Replace w->codec snd_soc_dapm_to_codec(w->dapm)

The codec field of the snd_soc_widget struct is eventually going to be
removed, use snd_soc_dapm_to_codec(w->dapm) instead.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5670.c

@@ -699,7 +699,7 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 static int is_sys_clk_from_pll(struct snd_soc_dapm_widget *source,
 			 struct snd_soc_dapm_widget *sink)
 {
-	struct snd_soc_codec *codec = source->codec;
+	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(source->dapm);
 	struct rt5670_priv *rt5670 = snd_soc_codec_get_drvdata(codec);
 
 	if (rt5670->sysclk_src == RT5670_SCLK_S_PLL1)