rionet: NULL pointer dereference

[Jesper Juhl]

Hi

Just noticed that drivers/net/rionet.c::rionet_remove() can cause a NULL 
deref when it calls unregister_netdev().
It initializes local variable 'ndev' to NULL and nothing changes this 
before the call to unregister_netdev(ndev) - that functions then calls: 
unregister_netdevice > unregister_netdevice_queue > list_move_tail > 
__list_del_entry  which dereferences the pointer (which, being NULL, will 
end in tears).

I won't claim to know this code nor what the proper fix is; just thought 
i'd report it so someone else with more knowledge of this could perhaps 
come up with a fix.

Have a nice day.

-- 
Jesper Juhl <jj@xxxxxxxxxxxxx>       http://www.chaosbits.net/
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