bug fix for 1233, this brings us on par with airmon-ng

git-svn-id: http://svn.aircrack-ng.org/trunk@2408 28c6078b-6c39-48e3-add9-af49d547ecab
airmon-zc: minor cleanup along with 1233

git-svn-id: http://svn.aircrack-ng.org/trunk@2409 28c6078b-6c39-48e3-add9-af49d547ecab