The code testing if a temperature should be emulated or not is
not obvious. Add a comment explaining why this test is done.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: NMikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: NZhang Rui <rui.zhang@intel.com>