ASoC: wm8983: 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.bias_level with snd_soc_codec_get_bias_level().

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/wm8983.c

@@ -915,7 +915,7 @@ static int wm8983_set_bias_level(struct snd_soc_codec *codec,
 				    1 << WM8983_VMIDSEL_SHIFT);
 		break;
 	case SND_SOC_BIAS_STANDBY:
-		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
 			ret = regcache_sync(wm8983->regmap);
 			if (ret < 0) {
 				dev_err(codec->dev, "Failed to sync cache: %d\n", ret);