Only allocate memory for struct fujitsu_laptop when the FUJ02E3 ACPI
device is present.  Use devm_kzalloc() for allocating memory to simplify
cleanup.
Signed-off-by: NMichał Kępień <kernel@kempniu.pl>
Reviewed-by: NJonathan Woithe <jwoithe@just42.net>
Signed-off-by: NDarren Hart (VMware) <dvhart@infradead.org>