[PATCH] nameif cleanup

[Rob Sullivan]

Perhaps it'd be a good idea to do a Busybox-wide search just to see
how often memset(&foo, 0, ...) is used; if it's used consistently,
then that's enough reason to create a function in libbb.

(Incidentally, I'm not sure some of Vladimir's "reverted" changes -
http://www.busybox.net/cgi-bin/viewcvs.cgi/trunk/busybox/networking/nameif.c?rev=13342&r1=13333&r2=13342
- make sense. What's the point in freeing "line"?)

Rob