media: stm32-dcmi: do not fall into error on buffer starvation

Return silently instead of falling into error when running
out of available buffers when restarting capture.
Capture will be restarted when new buffers will be
provided by V4L2 client.
Signed-off-by: NHugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/stm32/stm32-dcmi.c

@@ -227,13 +227,10 @@ static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
 
 	/* Restart a new DMA transfer with next buffer */
 	if (list_empty(&dcmi->buffers)) {
-		dev_err(dcmi->dev, "%s: No more buffer queued, cannot capture buffer\n",
-			__func__);
-		dcmi->errors_count++;
+		dev_dbg(dcmi->dev, "Capture restart is deferred to next buffer queueing\n");
 		dcmi->active = NULL;
-
 		spin_unlock_irq(&dcmi->irqlock);
-		return -EINVAL;
+		return 0;
 	}
 
 	dcmi->active = list_entry(dcmi->buffers.next,