[MACVLAN]: Fix memleak on device removal/crash on module removal

[Patrick McHardy <kaber@trash.net>]

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commit 2fe876e51d1f053b55d8d50c3733b136b6add016
Author: Patrick McHardy <kaber@trash.net>
Date:   Wed May 7 09:43:05 2008 +0200

    [MACVLAN]: Fix memleak on device removal/crash on module removal
    
    As noticed by Ben Greear, macvlan crashes the kernel when unloading the
    module. The reason is that it tries to clean up the macvlan_port pointer
    on the macvlan device itself instead of the underlying device. A non-NULL
    pointer is taken as indication that the macvlan_handle_frame_hook is
    valid, when receiving the next packet on the underlying device it tries
    to call the NULL hook and crashes.
    
    Clean up the macvlan_port on the correct device to fix this.
    
    Signed-off-by; Patrick McHardy <kaber@trash.net>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 2056cfc..c36a03a 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -450,7 +450,7 @@ static void macvlan_dellink(struct net_device *dev)
 	unregister_netdevice(dev);
 
 	if (list_empty(&port->vlans))
-		macvlan_port_destroy(dev);
+		macvlan_port_destroy(port->dev);
 }
 
 static struct rtnl_link_ops macvlan_link_ops __read_mostly = {