[ALSA] Clean up PCM codes (take 2)

- Clean up initialization and destruction of substream instance
  Now snd_pcm_open_substream() alone does most initialization jobs.
  Add pcm_release callback for cleaning up at snd_pcm_release_substream()
- Tidy up PCM oss code

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/sound/pcm_oss.h b/include/sound/pcm_oss.h
index bff0778e1969..1d522aaa66df 100644
--- a/include/sound/pcm_oss.h
+++ b/include/sound/pcm_oss.h
@@ -70,7 +70,6 @@ struct snd_pcm_oss_file {
 struct snd_pcm_oss_substream {
         unsigned oss: 1;                        /* oss mode */
         struct snd_pcm_oss_setup *setup;                /* active setup */
-        struct snd_pcm_oss_file *file;
 };
 
 struct snd_pcm_oss_stream {