PM / devfreq: event: Fix the error and warning from script/checkpatch.pl

This patch just fixes following error and warning by using
scripts/checkpatch.pl.

- Follwoing issue from checkpatch.pl:
ERROR: space prohibited before that close parenthesis ')'
+	if (count < 0 ) {

WARNING: line over 80 characters
+	ptr = devres_alloc(devm_devfreq_event_release, sizeof(*ptr), GFP_KERNEL);

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>