ieee802154: check device type

I've observed a NULL pointer dereference in ieee802154_del_iface() during
netlink fuzzing. It's the ->wpan_phy dereference here:

        phy = dev->ieee802154_ptr->wpan_phy;

My bet is that we're not checking that this is an IEEE802154 interface,
so let's do what ieee802154_nl_get_dev() is doing. (Maybe we should even
be calling this directly?)

Cc: Lennert Buytenhek <[email protected]>
Cc: Alexander Aring <[email protected]>
Cc: Marcel Holtmann <[email protected]>
Cc: Dmitry Eremin-Solenikov <[email protected]>
Cc: Sergey Lapin <[email protected]>
Signed-off-by: Vegard Nossum <[email protected]>
Acked-by: Alexander Aring <[email protected]>
Signed-off-by: Stefan Schmidt <[email protected]>

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