platform/x86: hp-bioscfg: fix error reporting in hp_add_other_attributes()

Return a negative error code instead of returning success.

Fixes: a34fc329 ("platform/x86: hp-bioscfg: bioscfg")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/138641cc-52c0-41a5-8176-ad01c7e28c67@moroto.mountain


Reviewed-by: Jorge Lopez <jorge.lopez2@hp.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>