If netlink_init() fails on socket create or bind the cfg struct
provided as parameter is freed by netlink_init(). Callers of
netlink_init() also free this struct on their error paths leading
to double free.
Signed-hostap: Pontus Fuchs <pontus.fuchs@gmail.com>
As an initial step in sharing netlink helper functions among driver
wrappers, create a new file for netlink code and move operstate send
function there.
