thermal: core: Check passive delay in monitor_thermal_zone()

The only case in which thermal_zone_device_set_polling() is called
with its second argument equal to zero is when passive cooling is
under way and passive_delay_jiffies is 0, which only happens when
the given thermal zone is not polled at all.

If monitor_thermal_zone() is modified to check passive_delay_jiffies
directly, the check of the thermal_zone_device_set_polling() second
argument against 0 can be dropped and a passive_delay check can be
dropped from thermal_zone_device_register_with_trips(), so change the
code accordingly.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/2004353.PYKUYFuaPT@rjwysocki.net

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