[brussels-dev] code review: mac prop handle

[Artem Kachitchkine]

> Yes, rw_enter in mac_prop_update should be moved above 
> mac_proplist_find. I'll fix that.

I'm wrong, that's a different rw object. Perhaps we just need to hold on 
to i_mac_prop_lock while using a proplist pointer. Let me think about it.

-Artem