ASoC: WM8903: Free IRQ on device removal

Without this, request_irq on subsequent device initialization fails, and
the codec cannot be used.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8903.c

@@ -2046,8 +2046,13 @@ static int wm8903_probe(struct snd_soc_codec *codec)
 /* power down chip */
 static int wm8903_remove(struct snd_soc_codec *codec)
 {
+	struct wm8903_priv *wm8903 = snd_soc_codec_get_drvdata(codec);
+
 	wm8903_free_gpio(codec);
 	wm8903_set_bias_level(codec, SND_SOC_BIAS_OFF);
+	if (wm8903->irq)
+		free_irq(wm8903->irq, codec);
+
 	return 0;
 }