ASoC: SOF: ipc4-control: If there is no data do not send bytes update

When the bytes control have no data (payload) then there is no need to send
an IPC message as there is nothing to send.

Fixes: a062c88 ("ASoC: SOF: ipc4-control: Add support for bytes control get and put")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/sof/ipc4-control.c

@@ -412,8 +412,16 @@ static int sof_ipc4_set_get_bytes_data(struct snd_sof_dev *sdev,
 	int ret = 0;
 
 	/* Send the new data to the firmware only if it is powered up */
-	if (set && !pm_runtime_active(sdev->dev))
-		return 0;
+	if (set) {
+		if (!pm_runtime_active(sdev->dev))
+			return 0;
+
+		if (!data->size) {
+			dev_dbg(sdev->dev, "%s: No data to be sent.\n",
+				scontrol->name);
+			return 0;
+		}
+	}
 
 	msg->extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(data->type);