ASoC: Update WARN uses in wm_hubs

Add missing newlines.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm_hubs.c

@@ -123,7 +123,7 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
 			reg_r = reg & WM8993_DCS_DAC_WR_VAL_0_MASK;
 			break;
 		default:
-			WARN(1, "Unknown DCS readback method");
+			WARN(1, "Unknown DCS readback method\n");
 			break;
 		}