bridge: add notification over netlink when STP changes state

When STP changes state of interface need to send a new link
message to reflect that change.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
index 3e96514..58de2a0 100644
--- a/net/bridge/br_stp_timer.c
+++ b/net/bridge/br_stp_timer.c
@@ -97,6 +97,7 @@
 		netif_carrier_on(br->dev);
 	}
 	br_log_state(p);
+	br_ifinfo_notify(RTM_NEWLINK, p);
 	spin_unlock(&br->lock);
 }