net: Make devnet_rename_seq static

No users outside net/core/dev.c.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -1666,9 +1666,6 @@ extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
 
 extern rwlock_t				dev_base_lock;		/* Device list lock */
 
-extern seqcount_t	devnet_rename_seq;	/* Device rename seq */
-
-
 #define for_each_netdev(net, d)		\
 		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
 #define for_each_netdev_reverse(net, d)	\

net/core/dev.c

@@ -174,7 +174,7 @@ static DEFINE_SPINLOCK(napi_hash_lock);
 static unsigned int napi_gen_id;
 static DEFINE_HASHTABLE(napi_hash, 8);
 
-seqcount_t devnet_rename_seq;
+static seqcount_t devnet_rename_seq;
 
 static inline void dev_base_seq_inc(struct net *net)
 {