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>
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index bed7a46..f9c3df0 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -137,8 +137,6 @@
 
 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 */