ASoC: wm8996: Replace BUG() with WARN()

BUG() used in the driver is just to spit the stack trace on buggy
points, not really needed to stop the whole operation.  For that
purpose, it'd be more convenient to use WARN() instead with more
error information.

Cc: patches@opensource.wolfsonmicro.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/wm8996.c

@@ -608,7 +608,7 @@ static int bg_event(struct snd_soc_dapm_widget *w,
 		wm8996_bg_disable(codec);
 		break;
 	default:
-		BUG();
+		WARN(1, "Invalid event %d\n", event);
 		ret = -EINVAL;
 	}
 
@@ -625,7 +625,7 @@ static int cp_event(struct snd_soc_dapm_widget *w,
 		msleep(5);
 		break;
 	default:
-		BUG();
+		WARN(1, "Invalid event %d\n", event);
 		ret = -EINVAL;
 	}
 
@@ -646,7 +646,7 @@ static int rmv_short_event(struct snd_soc_dapm_widget *w,
 		wm8996->hpout_pending |= w->shift;
 		break;
 	default:
-		BUG();
+		WARN(1, "Invalid event %d\n", event);
 		return -EINVAL;
 	}
 
@@ -767,7 +767,7 @@ static int dcs_start(struct snd_soc_dapm_widget *w,
 		wm8996->dcs_pending |= 1 << w->shift;
 		break;
 	default:
-		BUG();
+		WARN(1, "Invalid event %d\n", event);
 		return -EINVAL;
 	}
 
@@ -1656,7 +1656,7 @@ static int wm8996_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 		lrclk_rx_reg = WM8996_AIF2_RX_LRCLK_2;
 		break;
 	default:
-		BUG();
+		WARN(1, "Invalid dai id %d\n", dai->id);
 		return -EINVAL;
 	}
 
@@ -1768,7 +1768,7 @@ static int wm8996_hw_params(struct snd_pcm_substream *substream,
 		dsp_shift = WM8996_DSP2_DIV_SHIFT;
 		break;
 	default:
-		BUG();
+		WARN(1, "Invalid dai id %d\n", dai->id);
 		return -EINVAL;
 	}