cpu: assert host pointer offset within block Make accesses safer in case we missed some check somewhere. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Amos Kong <akong@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>