Don't crash if mapping MEI PCI memory fails. This can happen if CONFIG_STRICT_DEVMEM is enabled. Change-Id: I33c75a7cccb4cefaa26f70aed4bdc4bd620cdad0 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/25398 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>