MFC r332087:

MFC r332087:

ifconf(): Always zero the whole struct ifreq.

The previous split of zeroing ifr_name and ifr_addr seperately is safe
on current architectures, but would be unsafe if pointers were larger
than 8 bytes. Combining the zeroing adds no real cost (a few
instructions) and makes the security property easier to verify.

Reviewed by:	kib, emaste
Obtained from:	CheriBSD
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14912

git-svn-id: svn://svn.freebsd.org/base/stable/10@332295 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f