Deauthentication of inactive STA causes a error

[David Gurevich]

I have seen this problem as well.

> 
> I've had a string of the "Could not find STA for this TX 
> error", but also
> when there was be active traffic to the station (and thus 
> should not have
> disassociated).  It seems to happen when a timeout reset occurs.
> 
>