ASoC: arizona: Add default cases for event switches

Since the addition of the WILL_PMU / WILL_PMD several of the switches in
arizona.c no longer cover all cases or have a default case. Whilst this
isn't causing any problems in the interests of robustness add default
cases.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/arizona.c

@@ -147,6 +147,8 @@ static int arizona_spk_ev(struct snd_soc_dapm_widget *w,
 						   0x4f5, 0x0da);
 		}
 		break;
+	default:
+		break;
 	}
 
 	return 0;
@@ -725,6 +727,9 @@ int arizona_in_ev(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol,
 		reg = snd_soc_read(codec, ARIZONA_INPUT_ENABLES);
 		if (reg == 0)
 			arizona_in_set_vu(codec, 0);
+		break;
+	default:
+		break;
 	}
 
 	return 0;
@@ -806,6 +811,8 @@ int arizona_out_ev(struct snd_soc_dapm_widget *w,
 			break;
 		}
 		break;
+	default:
+		break;
 	}
 
 	return 0;