ASoC: Report an error for unknown adav80x formats

Not only fixes error handling but also some uninitialized variable
warnings.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

sound/soc/codecs/adav80x.c

@@ -456,7 +456,7 @@ static int adav80x_set_capture_pcm_format(struct snd_soc_codec *codec,
 		val = ADAV80X_CAPTURE_WORD_LEN24;
 		break;
 	default:
-		break;
+		return -EINVAL;
 	}
 
 	snd_soc_update_bits(codec, adav80x_port_ctrl_regs[dai->id][0],
@@ -488,7 +488,7 @@ static int adav80x_set_playback_pcm_format(struct snd_soc_codec *codec,
 		val = ADAV80X_PLAYBACK_MODE_RIGHT_J_24;
 		break;
 	default:
-		break;
+		return -EINVAL;
 	}
 
 	snd_soc_update_bits(codec, adav80x_port_ctrl_regs[dai->id][1],