net: misc: Remove extern from function prototypes

There are a mix of function prototypes with and without extern
in the kernel sources.  Standardize on not using extern for
function prototypes.

Function prototypes don't need to be written with extern.
extern is assumed by the compiler.  Its use is as unnecessary as
using auto to declare automatic/local variables in a block.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nf_internals.h b/net/netfilter/nf_internals.h
index 3deec99..61a3c92 100644
--- a/net/netfilter/nf_internals.h
+++ b/net/netfilter/nf_internals.h
@@ -13,26 +13,20 @@
 
 
 /* core.c */
-extern unsigned int nf_iterate(struct list_head *head,
-				struct sk_buff *skb,
-				unsigned int hook,
-				const struct net_device *indev,
-				const struct net_device *outdev,
-				struct nf_hook_ops **elemp,
-				int (*okfn)(struct sk_buff *),
-				int hook_thresh);
+unsigned int nf_iterate(struct list_head *head, struct sk_buff *skb,
+			unsigned int hook, const struct net_device *indev,
+			const struct net_device *outdev,
+			struct nf_hook_ops **elemp,
+			int (*okfn)(struct sk_buff *), int hook_thresh);
 
 /* nf_queue.c */
-extern int nf_queue(struct sk_buff *skb,
-		    struct nf_hook_ops *elem,
-		    u_int8_t pf, unsigned int hook,
-		    struct net_device *indev,
-		    struct net_device *outdev,
-		    int (*okfn)(struct sk_buff *),
-		    unsigned int queuenum);
-extern int __init netfilter_queue_init(void);
+int nf_queue(struct sk_buff *skb, struct nf_hook_ops *elem, u_int8_t pf,
+	     unsigned int hook, struct net_device *indev,
+	     struct net_device *outdev, int (*okfn)(struct sk_buff *),
+	     unsigned int queuenum);
+int __init netfilter_queue_init(void);
 
 /* nf_log.c */
-extern int __init netfilter_log_init(void);
+int __init netfilter_log_init(void);
 
 #endif