PM / devfreq: event: Call of_node_put() only once in devfreq_event_get_edev_by_phandle()

An of_node_put(node) call was immediately used after a null pointer check
for the local variable “edev” at the end of this function implementation.
Thus call such a function only once instead directly before the check.

This issue was transformed by using the Coccinelle software.

Link: https://lore.kernel.org/lkml/0f103384-376c-41f0-a35c-8ad98327d6cb@web.de/


Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>