ASoC: cs42l73: Make inv and format to be unsigned int

Fix below smatch warning:

sound/soc/codecs/cs42l73.c +1030 cs42l73_set_dai_fmt(53) error: inv is never equal to 1024 (wrong type 0 - 255).
sound/soc/codecs/cs42l73.c +1032 cs42l73_set_dai_fmt(55) error: inv is never equal to 768 (wrong type 0 - 255).
sound/soc/codecs/cs42l73.c +1036 cs42l73_set_dai_fmt(59) error: inv is never equal to 1024 (wrong type 0 - 255).

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/cs42l73.c

@@ -979,7 +979,7 @@ static int cs42l73_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct cs42l73_private *priv = snd_soc_codec_get_drvdata(codec);
 	u8 id = codec_dai->id;
-	u8 inv, format;
+	unsigned int inv, format;
 	u8 spc, mmcc;
 
 	spc = snd_soc_read(codec, CS42L73_SPC(id));