Suricata

With the introduction of netmap "partial opening" feature
netmap requires that one gets a new NETMAP_IF pointer after
every NIOCREGIF registration. Because this allocates an
independent instance of struct netmap_if. If one
separately opens hw rings and sw rings he/she'll get two
struct netmap_if, one with the valid hw rings, and the other
with valid sw rings.

Because of that code should get a new netmap_if pointer
after each NIOCREGIF.