MFC r331648:

MFC r331648:

Improve copy-and-pasted versions of SIOCGIFADDR.

The original implementation used a reference to ifr_data and a cast to
do the equivalent of accessing ifr_addr. This was copied multiple
times since 1996.

Approved by:	kib
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14873

git-svn-id: svn://svn.freebsd.org/base/stable/10@332160 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f