Use a few strlcpy() instead of strncpy() for network ioctl structs.
We seem to have no formal documentation stating the various

char if*_name[IFNAMSIZ]; /* if name, e.g. "en0" */

elements in ioctls are nul terminated, but the peanut gallery claims
it is so - and at least half of the code in-tree touching them agrees.

(martin)