include/linux/if_ether.h: Remove unused #define MAC_FMT

Last use was removed, so remove the #define.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_ether.h

@@ -137,8 +137,6 @@ extern struct ctl_table ether_table[];
 
 extern ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len);
 
-#define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
-
 #endif
 
 #endif	/* _LINUX_IF_ETHER_H */