mac80211: Do not free net device after it is unregistered.
The error path in ieee80211_register_hw() may call the unregister_netdev() and right after it - the free_netdev(), which is wrong, since the unregister releases the device itself. So the proposed fix is to NULL the local->mdev after unregister is done and check this before calling free_netdev(). I checked - no code uses the local->mdev after unregister in this error path (but even if some did this would be a BUG). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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