[MCAST] ipv6: Fix address size in grec_size

Signed-Off-By: NYan Zheng <yanzheng@21cn.com>
Acked-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: NDavid L Stevens <dlstevens@us.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/mcast.c

@@ -1393,7 +1393,7 @@ static void mld_sendpack(struct sk_buff *skb)
 
 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
 {
-	return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
+	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
 }
 
 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,