ASoC: wm8731: Convert to params_width()

The CODEC doesn't care how data is laid out in memory.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 5ada616..eebb328 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -348,13 +348,13 @@
 	snd_soc_write(codec, WM8731_SRATE, srate);
 
 	/* bit size */
-	switch (params_format(params)) {
-	case SNDRV_PCM_FORMAT_S16_LE:
+	switch (params_width(params)) {
+	case 16:
 		break;
-	case SNDRV_PCM_FORMAT_S20_3LE:
+	case 20:
 		iface |= 0x0004;
 		break;
-	case SNDRV_PCM_FORMAT_S24_LE:
+	case 24:
 		iface |= 0x0008;
 		break;
 	}