MFC r269873:

MFC r269873:
Fix broken pointer overflow check ns_name_unpack()

Many compilers may optimize away the overflow check `msg + l < msg',
where `msg' is a pointer and `l' is an integer, because pointer
overflow is undefined behavior in C.

Use a safe precondition test `l >= eom - msg' instead.

Reference:
https://android-review.googlesource.com/#/c/50570/

Requested by:	pfg
Obtained from:	NetBSD (CVS rev. 1.10)

git-svn-id: svn://svn.freebsd.org/base/stable/9@270852 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f