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This patch fixes the following bug: The thermal framework creates a temp*_crit interface, only when the get_crit_temp pointer is defined. But during the _unregister_ path, without checking for the function definition, it is trying to remove the temp*_crit interface. Signed-off-by: Durgadoss R <durgadoss.r@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>