ASoC: hdmi-codec.c: use devm_kzalloc() for DMA data

hdmi-codec.c is using kzalloc(), but we can replace it to
devm_kzalloc() and then, we can remove .remove callback.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/874jxhmjgw.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/hdmi-codec.c

@@ -823,7 +823,7 @@ static int hdmi_dai_probe(struct snd_soc_dai *dai)
 	if (ret)
 		return ret;
 
-	daifmt = kzalloc(sizeof(*daifmt), GFP_KERNEL);
+	daifmt = devm_kzalloc(dai->dev, sizeof(*daifmt), GFP_KERNEL);
 	if (!daifmt)
 		return -ENOMEM;
 
@@ -890,17 +890,10 @@ static int hdmi_dai_spdif_probe(struct snd_soc_dai *dai)
 	return 0;
 }
 
-static int hdmi_codec_dai_remove(struct snd_soc_dai *dai)
-{
-	kfree(dai->playback_dma_data);
-	return 0;
-}
-
 static const struct snd_soc_dai_driver hdmi_i2s_dai = {
 	.name = "i2s-hifi",
 	.id = DAI_ID_I2S,
 	.probe = hdmi_dai_probe,
-	.remove = hdmi_codec_dai_remove,
 	.playback = {
 		.stream_name = "I2S Playback",
 		.channels_min = 2,
@@ -925,7 +918,6 @@ static const struct snd_soc_dai_driver hdmi_spdif_dai = {
 	.name = "spdif-hifi",
 	.id = DAI_ID_SPDIF,
 	.probe = hdmi_dai_spdif_probe,
-	.remove = hdmi_codec_dai_remove,
 	.playback = {
 		.stream_name = "SPDIF Playback",
 		.channels_min = 2,