If init_list__init returns failure when initialising kvm tool, we can't
rely on our structures being fully initialised, so die rather than try
to continue and fail gracefully later on.

This prevents a SEGV when kvm is not available on the host:

  Error: '/dev/kvm' not found. Please make sure your kernel has CONFIG_KVM enabled and that the KVM modules are loaded.
  Warning: Failed init: kvm__init

Segmentation fault

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>