[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>

sound/core/oss/pcm_oss.c

@@ -1705,13 +1705,12 @@ static int snd_pcm_oss_release_file(snd_pcm_oss_file_t *pcm_oss_file)
 		if (snd_pcm_running(substream))
 			snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
 		snd_pcm_stream_unlock_irq(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_oss_release_substream(substream);
 		snd_pcm_release_substream(substream);
 	}
@@ -1778,14 +1777,13 @@ static int snd_pcm_oss_open_file(struct file *file,
 			snd_pcm_oss_release_file(pcm_oss_file);
 			return err;
 		}
-		psubstream->open_flag = 1;
+		psubstream->ffile = file;
 		err = snd_pcm_hw_constraints_complete(psubstream);
 		if (err < 0) {
 			snd_printd("snd_pcm_hw_constraint_complete failed\n");
 			snd_pcm_oss_release_file(pcm_oss_file);
 			return err;
 		}
-		psubstream->ffile = file;
 		snd_pcm_oss_init_substream(psubstream, psetup, minor);
 	}
 	if (csubstream != NULL) {
@@ -1800,14 +1798,13 @@ static int snd_pcm_oss_open_file(struct file *file,
 			snd_pcm_oss_release_file(pcm_oss_file);
 			return err;
 		}
-		csubstream->open_flag = 1;
+		csubstream->ffile = file;
 		err = snd_pcm_hw_constraints_complete(csubstream);
 		if (err < 0) {
 			snd_printd("snd_pcm_hw_constraint_complete failed\n");
 			snd_pcm_oss_release_file(pcm_oss_file);
 			return err;
 		}
-		csubstream->ffile = file;
 		snd_pcm_oss_init_substream(csubstream, csetup, minor);
 	}