media: atomisp: Flush queue on atomisp_css_start() error

I managed to trigger an atomisp_css_start() error by pushing my test system
towards an OOM situation, this triggered the following WARN_ON() in
__vb2_queue_cancel() in videobuf2-core.c:

        /*
         * If you see this warning, then the driver isn't cleaning up properly
         * after a failed start_streaming(). See the start_streaming()
         * documentation in videobuf2-core.h for more information how buffers
         * should be returned to vb2 in start_streaming().
         */
        if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {

Fix this by calling atomisp_flush_video_pipe() to return any queued buffers
back to the videobuf2-core on an atomisp_css_start() error.
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -1353,8 +1353,10 @@ int atomisp_start_streaming(struct vb2_queue *vq, unsigned int count)
 	asd->params.dvs_6axis = NULL;
 
 	ret = atomisp_css_start(asd, css_pipe_id, false);
-	if (ret)
+	if (ret) {
+		atomisp_flush_video_pipe(pipe, true);
 		goto out_unlock;
+	}
 
 	spin_lock_irqsave(&isp->lock, irqflags);
 	asd->streaming = ATOMISP_DEVICE_STREAMING_ENABLED;