ASoC: wm8997: 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: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm8997.c

@@ -1055,13 +1055,14 @@ static struct snd_soc_dai_driver wm8997_dai[] = {
 
 static int wm8997_codec_probe(struct snd_soc_codec *codec)
 {
+	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
 	struct wm8997_priv *priv = snd_soc_codec_get_drvdata(codec);
 
 	arizona_init_spk(codec);
 
-	snd_soc_dapm_disable_pin(&codec->dapm, "HAPTICS");
+	snd_soc_dapm_disable_pin(dapm, "HAPTICS");
 
-	priv->core.arizona->dapm = &codec->dapm;
+	priv->core.arizona->dapm = dapm;
 
 	return 0;
 }