net: Kill ether_table[] declaration.

This got missed back in 2006 when Jes Sorensen deleted
net/ethernet/sysctl_net_ether.c
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/if_ether.h

@@ -132,10 +132,6 @@ static inline struct ethhdr *eth_hdr(const struct sk_buff *skb)
 
 int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
 
-#ifdef CONFIG_SYSCTL
-extern struct ctl_table ether_table[];
-#endif
-
 int mac_pton(const char *s, u8 *mac);
 extern ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len);