[IPV6]: Fix ECN bug on big-endian

__constant_htons(2<<4) is not a replacement for
htonl(2<<20).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
index d599c6b..7849844 100644
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -48,7 +48,7 @@
 
 #define	IP6_ECN_flow_xmit(sk, label) do {				\
 	if (INET_ECN_is_capable(inet_sk(sk)->tos))			\
-		(label) |= __constant_htons(INET_ECN_ECT_0 << 4);	\
+		(label) |= htonl(INET_ECN_ECT_0 << 20);			\
     } while (0)
 
 static inline int IP_ECN_set_ce(struct iphdr *iph)