ASoC: wm8804: Replace direct snd_soc_codec dapm field access

The dapm field of the snd_soc_codec struct is eventually going to be
removed, in preparation for this replace all manual access to codec->dapm
with snd_soc_codec_get_dapm().
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Acked-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/wm8804.c

@@ -162,7 +162,7 @@ static int txsrc_put(struct snd_kcontrol *kcontrol,
 		     struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
-	struct snd_soc_dapm_context *dapm = &codec->dapm;
+	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	unsigned int val = ucontrol->value.enumerated.item[0] << e->shift_l;
 	unsigned int mask = 1 << e->shift_l;