ASoC: wm8994: Fix setting rate_reg for wm8994-aif2

For wm8994-aif2, the rate_reg should be WM8994_AIF2_RATE.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org

sound/soc/codecs/wm8994.c

@@ -2311,7 +2311,7 @@ static void wm8994_aif_shutdown(struct snd_pcm_substream *substream,
 		rate_reg = WM8994_AIF1_RATE;
 		break;
 	case 2:
-		rate_reg = WM8994_AIF1_RATE;
+		rate_reg = WM8994_AIF2_RATE;
 		break;
 	default:
 		break;