ASoC: Fix build error caused by merging a fix for 2.6.37 into 2.6.38

Fix "ASoC: Fix bias power down of non-DAPM codec" for 3.6.37 will cause a
build error when merging into ASoC for-2.6.38. Fix the issue by doing a
change that commit ce6120cc "ASoC: Decouple DAPM from CODECs" would do.
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-dapm.c

@@ -982,7 +982,7 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
 			sys_power = 1;
 			break;
 		case SND_SOC_DAPM_STREAM_STOP:
-			sys_power = !!codec->active;
+			sys_power = !!dapm->codec->active;
 			break;
 		case SND_SOC_DAPM_STREAM_SUSPEND:
 			sys_power = 0;