tipc: purge links when bearer is disabled

If a bearer is disabled by manual intervention, all links over that
bearer should be purged, indicated with the 'shutting_down' flag.
Otherwise tipc will get confused if a new bearer is enabled using
a different media type.

Signed-off-by: Erik Hugne <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/tipc/bearer.c

···
 		return -EINVAL;
 	}
 
-	bearer_disable(net, bearer, false);
+	bearer_disable(net, bearer, true);
 	rtnl_unlock();
 
 	return 0;