[PATCH] Fix bug in snd-usb-usx2y's usX2Y_pcms_lock_check()

Fix bug in snd-usb-usx2y's usX2Y_pcms_lock_check()

substream can be NULL......
in mainline, bug was introduced by:
2006-06-22  [ALSA] Add O_APPEND flag support to PCM

Signed-off-by: Karsten Wiese <[email protected]>



--- alsa-kernel/usb/usx2y/usx2yhwdeppcm.c~	2006-06-29 23:25:30.000000000 +0200
+++ alsa-kernel/usb/usx2y/usx2yhwdeppcm.c	2006-10-03 14:05:12.000000000 +0200
@@ -632,7 +632,7 @@ static int usX2Y_pcms_lock_check(struct 
 		for (s = 0; s < 2; ++s) {
 			struct snd_pcm_substream *substream;
 			substream = pcm->streams[s].substream;
-			if (SUBSTREAM_BUSY(substream))
+			if (substream && SUBSTREAM_BUSY(substream))
 				err = -EBUSY;
 		}
 	}
-
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