die() does never return. Annotate it as such.

die() does never return. Annotate it as such.
Any endless loop after die() can be eliminated.
Dereferencing a NULL pointer is bad. die() instead.
Replace endless loops with die().

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4340 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1