intel_th: pti: Do remove sysfs group on device removal

Right now, the PTI output driver forgets to clean up its sysfs group
when it gets removed. Fix this.
Reported-by: Alan Cox <alan.cox@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>

drivers/hwtracing/intel_th/pti.c

@@ -230,6 +230,7 @@ static int intel_th_pti_probe(struct intel_th_device *thdev)
 
 static void intel_th_pti_remove(struct intel_th_device *thdev)
 {
+	sysfs_remove_group(&thdev->dev.kobj, &pti_output_group);
 }
 
 static struct intel_th_driver intel_th_pti_driver = {