ipv6: udp: fix UDP_MIB_IGNOREDMULTI updates

IPv6 counters updates use a different macro than IPv4.

Fixes: 36cbb245 ("udp: Increment UDP_MIB_IGNOREDMULTI for arriving unmatched multicasts")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Rick Jones <rick.jones2@hp.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/udp.c

@@ -843,7 +843,7 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
 		flush_stack(stack, count, skb, count - 1);
 	} else {
 		if (!inner_flushed)
-			UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
+			UDP6_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
 					  proto == IPPROTO_UDPLITE);
 		consume_skb(skb);
 	}