cpufreq-dt: Drop unnecessary check before cpufreq_cooling_unregister() invocation

The cpufreq_cooling_unregister() function tests whether its argument is NULL
and then returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

(cherry picked from commit 17ad13ba842bd5c197e20c17e107788aa0498ba9)
Signed-off-by: Alex Shi <alex.shi@linaro.org>