media: ti-vpe: cal: Remove DMA queue empty check at start streaming time

The vb2 queue ensures that the start streaming operation will only be
called with a minimal number of buffers queued to the driver. There's
thus no need to manually check if the DMA queue is empty. Remove the
check.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/ti-vpe/cal-video.c

@@ -511,12 +511,6 @@ static int cal_start_streaming(struct vb2_queue *vq, unsigned int count)
 	int ret;
 
 	spin_lock_irq(&ctx->slock);
-	if (list_empty(&dma_q->active)) {
-		spin_unlock_irq(&ctx->slock);
-		ctx_dbg(3, ctx, "buffer queue is empty\n");
-		return -EIO;
-	}
-
 	buf = list_entry(dma_q->active.next, struct cal_buffer, list);
 	ctx->cur_frm = buf;
 	ctx->next_frm = buf;