ASoC: stm32: spdifrx: change trace level on iec control

Change trace level to debug to avoid spurious messages.
Return quietly when accessing iec958 control, while no
S/PDIF signal is available.
Signed-off-by: NOlivier Moysan <olivier.moysan@st.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/stm/stm32_spdifrx.c

@@ -496,7 +496,7 @@ static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
 	if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion,
 						      msecs_to_jiffies(100))
 						      <= 0) {
-		dev_err(&spdifrx->pdev->dev, "Failed to get control data\n");
+		dev_dbg(&spdifrx->pdev->dev, "Failed to get control data\n");
 		ret = -EAGAIN;
 	}