media: staging/intel-ipu3: Reset imgu_video_device sequence

Reset the sequence number of imgu_video_device on stream start.
Failing to do so results in sequence number getting incremented
for consecutive stream on/off cycles.
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/ipu3/ipu3-v4l2.c

@@ -485,6 +485,7 @@ static int imgu_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
 
 	pipe = node->pipe;
 	imgu_pipe = &imgu->imgu_pipe[pipe];
+	atomic_set(&node->sequence, 0);
 	r = media_pipeline_start(&node->vdev.entity, &imgu_pipe->pipeline);
 	if (r < 0)
 		goto fail_return_bufs;