ipv4: Fix build with multicast disabled.

net/ipv4/igmp.c: In function 'ip_mc_inc_group':
net/ipv4/igmp.c:1228: error: implicit declaration of function 'for_each_pmc_rtnl'
net/ipv4/igmp.c:1228: error: expected ';' before '{' token
net/ipv4/igmp.c: In function 'ip_mc_unmap':
net/ipv4/igmp.c:1333: error: expected ';' before 'igmp_group_dropped'
 ...

Move for_each_pmc_rcu and for_each_pmc_rtnl macro definitions
outside of multicast ifdef protection.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/igmp.c

@@ -163,6 +163,16 @@ static void ip_ma_put(struct ip_mc_list *im)
 	}
 }
 
+#define for_each_pmc_rcu(in_dev, pmc)				\
+	for (pmc = rcu_dereference(in_dev->mc_list);		\
+	     pmc != NULL;					\
+	     pmc = rcu_dereference(pmc->next_rcu))
+
+#define for_each_pmc_rtnl(in_dev, pmc)				\
+	for (pmc = rtnl_dereference(in_dev->mc_list);		\
+	     pmc != NULL;					\
+	     pmc = rtnl_dereference(pmc->next_rcu))
+
 #ifdef CONFIG_IP_MULTICAST
 
 /*
@@ -502,16 +512,6 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 	return skb;
 }
 
-#define for_each_pmc_rcu(in_dev, pmc)				\
-	for (pmc = rcu_dereference(in_dev->mc_list);		\
-	     pmc != NULL;					\
-	     pmc = rcu_dereference(pmc->next_rcu))
-
-#define for_each_pmc_rtnl(in_dev, pmc)				\
-	for (pmc = rtnl_dereference(in_dev->mc_list);		\
-	     pmc != NULL;					\
-	     pmc = rtnl_dereference(pmc->next_rcu))
-
 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 {
 	struct sk_buff *skb = NULL;