Removed unused inet6 address state

the inet6 state INET6_IFADDR_STATE_UP only appeared in its definition.

Cc: Christoph Paasch <christoph.paasch@uclouvain.be>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NSébastien Barré <sebastien.barre@uclouvain.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/if_inet6.h

@@ -35,7 +35,6 @@ enum {
 	INET6_IFADDR_STATE_DAD,
 	INET6_IFADDR_STATE_POSTDAD,
 	INET6_IFADDR_STATE_ERRDAD,
-	INET6_IFADDR_STATE_UP,
 	INET6_IFADDR_STATE_DEAD,
 };