Impact: unification

This patch adds sanity checks that are already in init_64.c to init_32.c.
Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <1236078902.2675.16.camel@penberg-laptop>
Signed-off-by: NIngo Molnar <mingo@elte.hu>