airmon-zc: remove stray return from previous commit

git-svn-id: http://svn.aircrack-ng.org/trunk@2400 28c6078b-6c39-48e3-add9-af49d547ecab
airmon-zc: users can now start the monitor interface again to change channels, although personally this seems like the worst possible way to change channels

git-svn-id: http://svn.aircrack-ng.org/trunk@2401 28c6078b-6c39-48e3-add9-af49d547ecab