device: modify handling master devicedcbw/devices-for-all-7

I found the handling of the master-device very confusing because it was
unclear who sets priv->master, and when it should be set.

Now:

- priv->master should be always set when a device is added to the
  master and vice-versa.

- priv->master gets now only cleared by nm_device_slave_release_from_master().
  It only gets set by device_recheck_slave_status() and master_ready() --
  the latter two immediately do a nm_device_master_add_slave() afterwards.

- priv->is_enslaved should be only set/cleared by
  nm_device_slave_notify_*(). It can only be true, when
  priv->master is set too.

Add assertions for that.

0 files changed, 0 insertions, 0 deletions