[PATCH] don't bring the interface down if WoWLAN is enabled

[Johannes Berg]

> 
> S5 is not "mostly powered off", S5 is power off.
> So the only way to wake up from power off is to leave the card
> powered, and wpa_s actually prevent this.

It's still the wrong thing to make wpa_s unconditionally leave the NIC
turned on, especially if it's no longer managing it.

Frankly, there isn't really a good way to let the NIC stay powered in
S5 anyway because it may wake up for a number of reasons like 4-way-
handshake, and that's not what you want.

johannes