[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/pci/emu10k1/p16v.c b/sound/pci/emu10k1/p16v.c
index 465f8d5..7ee19c6 100644
--- a/sound/pci/emu10k1/p16v.c
+++ b/sound/pci/emu10k1/p16v.c
@@ -433,7 +433,6 @@
 	struct snd_emu10k1_pcm *epcm;
 	int channel;
 	int result = 0;
-	struct list_head *pos;
         struct snd_pcm_substream *s;
 	u32 basic = 0;
 	u32 inte = 0;
@@ -448,8 +447,7 @@
 		running = 0;
 		break;
 	}
-        snd_pcm_group_for_each(pos, substream) {
-                s = snd_pcm_group_substream_entry(pos);
+        snd_pcm_group_for_each_entry(s, substream) {
 		runtime = s->runtime;
 		epcm = runtime->private_data;
 		channel = substream->pcm->device-emu->p16v_device_offset;