ASoC: max98090: 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/max98090.c

@@ -806,7 +806,7 @@ static const struct snd_kcontrol_new max98091_snd_controls[] = {
 static int max98090_micinput_event(struct snd_soc_dapm_widget *w,
 				 struct snd_kcontrol *kcontrol, int event)
 {
-	struct snd_soc_codec *codec = w->codec;
+	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 	struct max98090_priv *max98090 = snd_soc_codec_get_drvdata(codec);
 
 	unsigned int val = snd_soc_read(codec, w->reg);