[ALSA] pcm-oss - Add bugg-yptr option

Documentation,ALSA<-OSS emulation
Added 'buggy-ptr' proc option to switch the behavior of GETOPTR ioctl.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/pcm_oss.h b/include/sound/pcm_oss.h
index 5187285..0b67c9d 100644
--- a/include/sound/pcm_oss.h
+++ b/include/sound/pcm_oss.h
@@ -32,7 +32,8 @@
 		     block:1,
 		     nonblock:1,
 		     partialfrag:1,
-		     nosilence:1;
+		     nosilence:1,
+		     buggyptr:1;
 	unsigned int periods;
 	unsigned int period_size;
 	snd_pcm_oss_setup_t *next;