Pull up following revision(s) (requested by mrg in ticket #1480):
sys/dev/vnd.c: 1.260, 1.262 via patch
Put in a litany of judicious bounds checks around vnd headers.
Thought I was done with this crap after I rewrote vndcompress(1)!
From Ilja Van Sprundel.
--
Appease toxic bullshit warning from gcc.
If you have a better way to write a useful bounds check that happens
to always pass on LP64 but doesn't always on LP32, without making it
fail to compile on LP64 or making it an #ifdef conditional on LP32,
please put it in here instead.

(snj)