Fixed the bug for getting the channel# for a malformed beacon. When the beacon is malformed, one cannot index the Dot11Elt and also cannot get the correct channel#.
Fixed the bug for getting the channel# for a malformed beacon.
When the beacon is malformed, one cannot index the Dot11Elt and also
cannot get the correct channel#.

MrMugiwara/wifiphisher,MrMugiwara/wifiphisher