nl80211: fix UNSPEC signal quality reporting

[Jouni Malinen]

On Mon, Nov 14, 2011 at 06:35:39PM -0600, Dan Williams wrote:
> r->level got assigned so it's clearly not INVALID; instead
> r->qual should be invalid.

Thanks, applied.

-- 
Jouni Malinen                                            PGP id EFC895FA