The ISC license is considered as not recommended in "Linux kernel licensing
rules". It should only be used for existing code or for importing code from
a different project with that license.

But the kernel still has the similar sounding MIT/Expat license under the
preferred licenses. Switching to this license for this relatively new file
should therefore allow batman-adv to better follow the new licensing rules.
Signed-off-by: NSven Eckelmann <sven@narfation.org>
Acked-by: NAntonio Quartulli <a@unstable.cc>
Acked-by: NMatthias Schiffer <mschiffer@universe-factory.net>
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NSimon Wunderlich <sw@simonwunderlich.de>