ASoC: max98090: Fix missing free_irq

max98090.c doesn't free the threaded interrupt it requests. This causes
an oops when doing "cat /proc/interrupts" after snd-soc-max98090.ko is
unloaded.

Fix this by requesting the interrupt by using devm_request_threaded_irq().

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Cc: Stable <stable@vger.kernel.org> # 3.10+
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/max98090.c

@@ -2284,7 +2284,7 @@ static int max98090_probe(struct snd_soc_codec *codec)
 	/* Register for interrupts */
 	dev_dbg(codec->dev, "irq = %d\n", max98090->irq);
 
-	ret = request_threaded_irq(max98090->irq, NULL,
+	ret = devm_request_threaded_irq(codec->dev, max98090->irq, NULL,
 		max98090_interrupt, IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 		"max98090_interrupt", codec);
 	if (ret < 0) {