airo: Buffer overflow

SSID_rid has space for only 3 ssids.
txPowerLevels[i] is read before the bounds check for i

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>