ASoC: amd: use asoc_substream_to_rtd()

Uses asoc_substream_to_rtd() helper.
Signed-off-by: Zhen Ni <nizhen@uniontech.com>
Link: https://lore.kernel.org/r/20220302081502.25367-1-nizhen@uniontech.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/vangogh/acp5x-mach.c

@@ -101,7 +101,7 @@ static const struct snd_pcm_hw_constraint_list constraints_channels = {
 static int acp5x_8821_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_card *card = rtd->card;
 	struct acp5x_platform_info *machine = snd_soc_card_get_drvdata(card);
 
@@ -119,7 +119,7 @@ static int acp5x_8821_startup(struct snd_pcm_substream *substream)
 static int acp5x_nau8821_hw_params(struct snd_pcm_substream *substream,
 				   struct snd_pcm_hw_params *params)
 {
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_card *card = rtd->card;
 	struct snd_soc_dai *codec_dai =
 			snd_soc_card_get_codec_dai(card,
@@ -141,7 +141,7 @@ static int acp5x_nau8821_hw_params(struct snd_pcm_substream *substream,
 static int acp5x_cs35l41_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_card *card = rtd->card;
 	struct acp5x_platform_info *machine = snd_soc_card_get_drvdata(card);
 
@@ -158,7 +158,7 @@ static int acp5x_cs35l41_startup(struct snd_pcm_substream *substream)
 static int acp5x_cs35l41_hw_params(struct snd_pcm_substream *substream,
 				   struct snd_pcm_hw_params *params)
 {
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_card *card = rtd->card;
 	struct snd_soc_dai *codec_dai;
 	int ret, i;