ASoC: wm8994: check for array index returned

The array 'drc_cfg' of size 3 may use index value -22 (EINVAL)
The array 'retune_mobile_cfg' of size 3 may use index value -22 (EINVAL)

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8994.c

@@ -383,6 +383,8 @@ static int wm8994_get_drc_enum(struct snd_kcontrol *kcontrol,
 	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 	int drc = wm8994_get_drc(kcontrol->id.name);
 
+	if (drc < 0)
+		return drc;
 	ucontrol->value.enumerated.item[0] = wm8994->drc_cfg[drc];
 
 	return 0;
@@ -488,6 +490,9 @@ static int wm8994_get_retune_mobile_enum(struct snd_kcontrol *kcontrol,
 	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 	int block = wm8994_get_retune_mobile_block(kcontrol->id.name);
 
+	if (block < 0)
+		return block;
+
 	ucontrol->value.enumerated.item[0] = wm8994->retune_mobile_cfg[block];
 
 	return 0;