[PATCH, take 2] libertas: implement new scanning logic

[Holger Schurig]

[18:26] <dcbw> schurig: you've got an unused variable in the scan 
patch btw
[18:26] 
<dcbw> /home/dcbw/Development/libertas-2.6/drivers/net/wireless/libertas/scan.c: 
In function ‘lbs_set_scan’:
[18:26] 
<dcbw> /home/dcbw/Development/libertas-2.6/drivers/net/wireless/libertas/scan.c:1347: 
warning: unused

That has been fixen in this take2, too.