ibss: Use common freqchan helper for joining an ibss
ibss: Use common freqchan helper for joining an ibss

Simplify code by using the helper which has been introduced earlier.

Signed-off-by: Benjamin Berg <5773a15f5b167cc5d83f29b1be36ea836f15a3dc@open-mesh.com>
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

greearb/iw-ct,greearb/iw-ct