bridge: Do not unregister all PF_BRIDGE rtnl operations

Bridge fdb and link rtnl operations are registered in
core/rtnetlink.  Bridge mdb operations are registred
in bridge/mdb.  When removing bridge module, do not
unregister ALL PF_BRIDGE ops since that would remove
the ops from rtnetlink as well.  Do remove mdb ops when
bridge is destroyed.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index dce9def..5391ca4 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1633,6 +1633,7 @@
 	del_timer_sync(&br->multicast_querier_timer);
 	del_timer_sync(&br->multicast_query_timer);
 
+	br_mdb_uninit();
 	spin_lock_bh(&br->multicast_lock);
 	mdb = mlock_dereference(br->mdb, br);
 	if (!mdb)