PM / devfreq: fix duplicated kfree on devfreq pointer

device_unregister() calls kfree already.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 3801737..6f33c1e 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -603,7 +603,6 @@
 err_init:
 	list_del(&devfreq->node);
 	device_unregister(&devfreq->dev);
-	kfree(devfreq);
 err_out:
 	return ERR_PTR(err);
 }