Merge r309639 from head:

Merge r309639 from head:

  Fix possible buffer overflow(s) in link_ntoa(3).

  A specially crafted sockaddr_dl argument can trigger a static buffer overflow
  in the libc library, with possibility to rewrite with arbitrary data following
  static buffers that belong to other library functions.

Reviewed by:	kib
Security:	FreeBSD-SA-16:37.libc

git-svn-id: svn://svn.freebsd.org/base/stable/10@309645 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f