[ALSA] ALSA's struct _snd_pcm_substream: Obsolete open_flag

PCM Midlevel,ALSA<-OSS emulation,USB USX2Y
This patch removes open_flag from struct _snd_pcm_substream.
All of its uses are substituted by querying struct _snd_pcm_substream's
member ffile instead.

Signed-off-by: Karsten Wiese <annabellesgarden@yahoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 10c2c98..5041be2 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1967,13 +1967,12 @@
 	runtime = substream->runtime;
 	str = substream->pstr;
 	snd_pcm_unlink(substream);
-	if (substream->open_flag) {
+	if (substream->ffile != NULL) {
 		if (substream->ops->hw_free != NULL)
 			substream->ops->hw_free(substream);
 		substream->ops->close(substream);
-		substream->open_flag = 0;
+		substream->ffile = NULL;
 	}
-	substream->ffile = NULL;
 	snd_pcm_remove_file(str, pcm_file);
 	snd_pcm_release_substream(substream);
 	kfree(pcm_file);
@@ -2022,18 +2021,15 @@
 		snd_pcm_release_file(pcm_file);
 		return err;
 	}
-	substream->open_flag = 1;
+	substream->ffile = file;
 
 	err = snd_pcm_hw_constraints_complete(substream);
 	if (err < 0) {
 		snd_printd("snd_pcm_hw_constraints_complete failed\n");
-		substream->ops->close(substream);
 		snd_pcm_release_file(pcm_file);
 		return err;
 	}
 
-	substream->ffile = file;
-
 	file->private_data = pcm_file;
 	*rpcm_file = pcm_file;
 	return 0;