lenovo/x200: Kill access to nonexisting device [copy-paste error]

Change-Id: I1be939e870e8792f5ebb23623fe8f7f119adec36
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6806
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>