[PATCH -mm] ALSA: add struct forward declaration

[Randy Dunlap <randy.dunlap@oracle.com>]

From: Randy Dunlap <randy.dunlap@oracle.com>

I see about 10 sets of these in a random config.

  CC      drivers/media/video/saa7134/saa7134-cards.o
In file included from drivers/media/video/saa7134/saa7134.h:43,
                 from drivers/media/video/saa7134/saa7134-cards.c:27:
include/sound/pcm.h:59: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:59: warning: its scope is only this definition or declaration, which is probably not what you want
include/sound/pcm.h:60: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:62: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:64: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:65: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:66: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:67: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:68: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:71: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:73: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:75: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:76: warning: 'struct snd_pcm_substream' declared inside parameter list
include/sound/pcm.h:77: warning: 'struct snd_pcm_substream' declared inside parameter list

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---
 include/sound/pcm.h |    2 ++
 1 file changed, 2 insertions(+)

--- linux-2.6.19-rc6-mm2.orig/include/sound/pcm.h
+++ linux-2.6.19-rc6-mm2/include/sound/pcm.h
@@ -55,6 +55,8 @@ struct snd_pcm_hardware {
 	size_t fifo_size;		/* fifo size in bytes */
 };
 
+struct snd_pcm_substream;
+
 struct snd_pcm_ops {
 	int (*open)(struct snd_pcm_substream *substream);
 	int (*close)(struct snd_pcm_substream *substream);


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