mfd: wm8994: Silence warning about supplies during deferred probe

Don't confuse user with meaningless warning about the failure in getting
supplies in case of deferred probe.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/wm8994-core.c

@@ -393,7 +393,9 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 				 wm8994->supplies);
 	if (ret != 0) {
-		dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(wm8994->dev, "Failed to get supplies: %d\n",
+				ret);
 		goto err;
 	}