[ALSA] Add snd_pcm_group_for_each_entry() for code cleanup

Added a new macro snd_pcm_group_for_each_entry() just for code cleanup.
Old macros, snd_pcm_group_for_each() and snd_pcm_group_substream_entry(),
are removed.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/sparc/cs4231.c b/sound/sparc/cs4231.c
index 900a00d..96d51ab 100644
--- a/sound/sparc/cs4231.c
+++ b/sound/sparc/cs4231.c
@@ -661,10 +661,9 @@
 	{
 		unsigned int what = 0;
 		struct snd_pcm_substream *s;
-		struct list_head *pos;
 		unsigned long flags;
 
-		snd_pcm_group_for_each(pos, substream) {
+		snd_pcm_group_for_each_entry(s, substream) {
 			s = snd_pcm_group_substream_entry(pos);
 			if (s == chip->playback_substream) {
 				what |= CS4231_PLAYBACK_ENABLE;