clean up usage code
clean up usage code

chunyeow/iw,bw-oss/iw,Distrotech/iw,TeamEOS/external_iw,greearb/iw-ct,OSLL/iw,cozybit/iw,timduru/platform-external-iw,bcopeland/android_iw,Distrotech/iw,greearb/iw-ct,timduru/platform-external-iw,chunyeow/iw,idor/iw,CTU-IIG/802.11p-iw,ewa/iw-modified,cozybit/iw,bcopeland/android_iw,TeamEOS/external_iw,ewa/iw-modified,OSLL/iw,idor/iw,SoluMachines/external_iw,bw-oss/iw,CTU-IIG/802.11p-iw,SoluMachines/external_iw