X25: Fix oops and refcnt problems from x25_dev_get
Calls to x25_dev_get check for dev = NULL which was not set. It allowed x25 to set routes and ioctls on down interfaces. This caused oopses and refcnt problems on device_unregister. Signed-off-by: NAndrew Hendry <andrew.hendry@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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