i40iw: Receive netdev events post INET_NOTIFIER state

i40iw: Receive netdev events post INET_NOTIFIER state

Netdev notification events are de-registered only when all
client iwdev instances are removed. If a single client is closed
and re-opened, netdev events could arrive even before the Control
Queue-Pair (CQP) is created, causing a NULL pointer dereference crash
in i40iw_get_cqp_request. Fix this by allowing netdev event
notification only after we have reached the INET_NOTIFIER state with
respect to device initialization.

Reported-by: Stefan Assmann <[email protected]>
Signed-off-by: Shiraz Saleem <[email protected]>
Reviewed-by: Yuval Shaia <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>