staging: mmal-vchiq: Free the event context for control ports

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

vchiq_mmal_component_init calls init_event_context for the
control port, but vchiq_mmal_component_finalise didn't free
it, causing a memory leak..

Add the free call.
Signed-off-by: NDave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c

@@ -1901,6 +1901,8 @@ int vchiq_mmal_component_finalise(struct vchiq_mmal_instance *instance,
 	for (idx = 0; idx < component->clocks; idx++)
 		free_event_context(&component->clock[idx]);
 
+	free_event_context(&component->control);
+
 	mutex_unlock(&instance->vchiq_mutex);
 
 	return ret;