power: supply: cpcap-battery: Fix pointless EPROBE_DEFER warnings

With loadable modules we may get the following during init:

could not initialize VBUS or ID IIO: -517

Let's not print any pointless error messages for deferred probe.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/cpcap-battery.c

@@ -669,8 +669,9 @@ static int cpcap_battery_init_iio(struct cpcap_battery_ddata *ddata)
 	return 0;
 
 out_err:
-	dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
-		error);
+	if (error != -EPROBE_DEFER)
+		dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
+			error);
 
 	return error;
 }