eeepc-laptop: check proper return values in get_cpufv
In get_cpufv the return value of get_acpi is stored in the cpufv struct.
Right before this value is checked for errors, it is and'ed with 0xff.
This means c->cur can never be less than zero. Besides that, the actual
error value is ignored.
c->num is also and'ed with 0xff, which means we can ignore values below
zero.
Check the result of get_acpi() right away. While at it, propagate the
error if we got one.
Signed-off-by: Frans Klaver <fransklaver@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
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