hsr: Fix a compilation error

A compliation error happen when building branch 5.5-rc7

In file included from net/hsr/hsr_main.c:12:0:
net/hsr/hsr_main.h:194:20: error: two or more data types in declaration specifiers
 static inline void void hsr_debugfs_rename(struct net_device *dev)

So Removed one void.

Fixes: 4c2d5e33 ("hsr: rename debugfs file when interface name is changed")
Signed-off-by: Nxiaofeng.yan <yanxiaofeng7@jd.com>
Acked-by: NTaehee Yoo <ap420073@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/hsr/hsr_main.h

@@ -191,7 +191,7 @@ void hsr_debugfs_term(struct hsr_priv *priv);
 void hsr_debugfs_create_root(void);
 void hsr_debugfs_remove_root(void);
 #else
-static inline void void hsr_debugfs_rename(struct net_device *dev)
+static inline void hsr_debugfs_rename(struct net_device *dev)
 {
 }
 static inline void hsr_debugfs_init(struct hsr_priv *priv,