Bug#497971: Same problem without ipwraw

[Hugo Grostabussiat <dw23.devel@gmail.com>]

I have just noticed I forgot to unload ipwraw module before sending the 
report.
Even after removing it from the system and rebooting, I still have the 
same results.
"iwlist wlan0 channel" output :
wlan0     19 channels in total; available frequencies :
         Channel 01 : 2.412 GHz
         Channel 02 : 2.417 GHz
         Channel 03 : 2.422 GHz
         Channel 04 : 2.427 GHz
         Channel 05 : 2.432 GHz
         Channel 06 : 2.437 GHz
         Channel 07 : 2.442 GHz
         Channel 08 : 2.447 GHz
         Channel 09 : 2.452 GHz
         Channel 10 : 2.457 GHz
         Channel 11 : 2.462 GHz
         Channel 36 : 5.18 GHz
         Channel 40 : 5.2 GHz
         Channel 44 : 5.22 GHz
         Channel 48 : 5.24 GHz
         Channel 52 : 5.26 GHz
         Channel 56 : 5.28 GHz
         Channel 60 : 5.3 GHz
         Channel 64 : 5.32 GHz
         Current Frequency=2.437 GHz (Channel 6)