[PATCH -next] sound: fix include/sound/core.h warning

[Randy Dunlap <rdunlap@xxxxxxxxxxxx>]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxx>

Fix build warning by providing a struct stub since no fields of
the struct are used:

include/sound/core.h:454:56: warning: 'struct pci_dev' declared inside parameter list

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Cc:	Jaroslav Kysela <perex@xxxxxxxx>
Cc:	Takashi Iwai <tiwai@xxxxxxx>
Cc:	alsa-devel@xxxxxxxxxxxxxxxx
---
 include/sound/core.h |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20120130.orig/include/sound/core.h
+++ linux-next-20120130/include/sound/core.h
@@ -450,6 +450,8 @@ struct snd_pci_quirk {
 	{_SND_PCI_QUIRK_ID_MASK(vend, 0, 0), .value = (val)}
 #endif
 
+struct pci_dev;
+
 const struct snd_pci_quirk *
 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
 
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