ASoC: wm8753: remove invalid free of devm_ allocated data

Fixes following warning.
sound/soc/codecs/wm8753.c:1594:1-6: WARNING: invalid free of devm_ allocated data
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8753.c

@@ -1591,7 +1591,6 @@ static int __devexit wm8753_spi_remove(struct spi_device *spi)
 
 	snd_soc_unregister_codec(&spi->dev);
 	regmap_exit(wm8753->regmap);
-	kfree(wm8753);
 	return 0;
 }