[PATCH] phy: Add missing forward declaration (fixes compiler warning)

[Stefan Weil]

Without forward declaration for struct sk_buff, compilation
of drivers/net/phy/fixed.c results in a warning:

  CC      drivers/net/phy/fixed.o
In file included from drivers/net/phy/fixed.c:20:
include/linux/phy.h:342: warning: 'struct sk_buff' declared inside parameter list
include/linux/phy.h:342: warning: its scope is only this definition or declaration, which is probably not what you want
include/linux/phy.h:343: warning: 'struct sk_buff' declared inside parameter list

(tested with linux kernel for openwrt / ar7, gcc-4.1.2)

Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Stefan Weil <weil@xxxxxxxxxxxxxxx>
---
 include/linux/phy.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 987e111..65e8d72 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -51,6 +51,8 @@
 #define PHY_HAS_INTERRUPT	0x00000001
 #define PHY_HAS_MAGICANEG	0x00000002
 
+struct sk_buff;
+
 /* Interface Mode definitions */
 typedef enum {
 	PHY_INTERFACE_MODE_MII,
-- 
1.5.6.5

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