vlan: Correctly handle device notifications for layered VLAN devices

Commit 30688a9 ([VLAN]: Handle vlan devices net namespace changing)
changed the device notifier to special-case notifications for VLAN
devices, effectively disabling state propagation to underlying VLAN
devices. This is needed for layered VLANs though, so restore the
original behaviour.

Signed-off-by: Patrick McHardy <[e-mail]>
Acked-by: Pavel Emelyanov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/8021q/vlan.c

···
 	int i, flgs;
 	struct net_device *vlandev;
 
-	if (is_vlan_dev(dev)) {
+	if (is_vlan_dev(dev))
 		__vlan_device_event(dev, event);
-		goto out;
-	}
 
 	grp = __vlan_find_group(dev);
 	if (!grp)