perf: Pass 0 as a third argument to ioctl on perf_fd

The third argument of PERF_EVENT_IOC_{ENABLE,DISABLE} ioctl is a flag
to determine whether the command should be applied to group members.
Since the powertop doesn't use the event grouping feature, it'd better
passing 0 as a third argument explicitly.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
1 file changed