netns: ipmr: declare mroute_do_assert and mroute_do_pim per-namespace

Preliminary work to make IPv4 multicast routing netns-aware.

Declare IPv multicast routing variables 'mroute_do_assert' and
'mroute_do_pim' per-namespace in struct netns_ipv4.

At the moment, these variables are only referenced in init_net.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 90b7cd2..8451722 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -61,6 +61,8 @@
 	struct vif_device	*vif_table;
 	int			maxvif;
 	atomic_t		cache_resolve_queue_len;
+	int			mroute_do_assert;
+	int			mroute_do_pim;
 #endif
 };
 #endif