ASoC: wm8900: 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>
diff --git a/sound/soc/codecs/wm8900.c b/sound/soc/codecs/wm8900.c
index e7d2ecd..ecc7b47 100644
--- a/sound/soc/codecs/wm8900.c
+++ b/sound/soc/codecs/wm8900.c
@@ -1049,7 +1049,7 @@
 
 	case SND_SOC_BIAS_STANDBY:
 		/* Charge capacitors if initial power up */
-		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
 			/* STARTUP_BIAS_ENA on */
 			snd_soc_write(codec, WM8900_REG_POWER1,
 				     WM8900_REG_POWER1_STARTUP_BIAS_ENA);