[IPV6] ADDRCONF: Fix conflicts in DEVCONF_xxx constant.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 09ea01a..648bd1f 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -209,9 +209,8 @@
 	DEVCONF_RTR_PROBE_INTERVAL,
 	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 	DEVCONF_PROXY_NDP,
-	__DEVCONF_OPTIMISTIC_DAD,
-	DEVCONF_ACCEPT_SOURCE_ROUTE,
 	DEVCONF_OPTIMISTIC_DAD,
+	DEVCONF_ACCEPT_SOURCE_ROUTE,
 	DEVCONF_MAX
 };