ASoC: Remove unused num_dai field from CODEC

Commit d191bd8d ("ASoC: snd_soc_codec includes snd_soc_component") removed the
last user of the num_dai field. Also remove the field itself.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/sound/soc.h

@@ -701,7 +701,6 @@ struct snd_soc_codec {
 	struct snd_soc_card *card;
 	struct list_head list;
 	struct list_head card_list;
-	int num_dai;
 
 	/* runtime */
 	struct snd_ac97 *ac97;  /* for ad-hoc ac97 devices */

sound/soc/soc-core.c

@@ -4277,7 +4277,6 @@ int snd_soc_register_codec(struct device *dev,
 	codec->dapm.stream_event = codec_drv->stream_event;
 	codec->dev = dev;
 	codec->driver = codec_drv;
-	codec->num_dai = num_dai;
 	codec->component.val_bytes = codec_drv->reg_word_size;
 	mutex_init(&codec->mutex);