Something

polux*CLI> zap show channels
   Chan Extension  Context         Language   MusicOnHold
 pseudo            default
polux*CLI> unload ch
chan_agent.so     chan_features.so  chan_iax2.so      chan_local.so     chan_mgcp.so      chan_oss.so       chan_phone.so     chan_sip.so       chan_skinny.so    chan_zap.so
polux*CLI> unload chan_zap.so
  == Manager unregistered action ZapDialOffhook
  == Manager unregistered action ZapHangup
  == Manager unregistered action ZapTransfer
  == Manager unregistered action ZapDNDoff
  == Manager unregistered action ZapDNDon
  == Manager unregistered action ZapShowChannels
  == Unregistered channel type 'Zap'
    -- Unregistered channel 1
polux*CLI>




that's odd, no zap channels registered (see the zap show channels), but unload chan_zap.so is giving 1, probably a wrong loop logic, whatcha think?