ASoC: hdmi-codec: Fix module unloading caused kernel crash

The hcp->chmap_info must not be freed up in the hdmi_codec_remove()
function as it leads to kernel crash due ALSA core's
pcm_chmap_ctl_private_free() is trying to free it up again when the card
destroyed via snd_card_free.

Since the driver was converted to devm_snd_soc_register_component() the
whole platform_device.remove can be removed.

Commit cd6111b2 ("ASoC: hdmi-codec: add channel mapping control")
should not have added the kfree(hcp->chmap_info); to the hdmi_codec_remove
function.

[Separate verison of the fix for -next -- broonie]
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/hdmi-codec.c

@@ -798,23 +798,11 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int hdmi_codec_remove(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct hdmi_codec_priv *hcp;
-
-	hcp = dev_get_drvdata(dev);
-	kfree(hcp->chmap_info);
-
-	return 0;
-}
-
 static struct platform_driver hdmi_codec_driver = {
 	.driver = {
 		.name = HDMI_CODEC_DRV_NAME,
 	},
 	.probe = hdmi_codec_probe,
-	.remove = hdmi_codec_remove,
 };
 
 module_platform_driver(hdmi_codec_driver);