ASoC: loongson: Use snd_soc_substream_to_rtd() for accessing private_data

Do not open-code snd_soc_substream_to_rtd().
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240430-asoc-snd-substream-clean-v1-9-6f8a8902b479@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/loongson/loongson_card.c

@@ -23,7 +23,7 @@ struct loongson_card_data {
 static int loongson_card_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 = snd_soc_substream_to_rtd(substream);
 	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 	struct loongson_card_data *ls_card = snd_soc_card_get_drvdata(rtd->card);

sound/soc/loongson/loongson_dma.c

@@ -226,7 +226,7 @@ static int loongson_pcm_open(struct snd_soc_component *component,
 			     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 = snd_soc_substream_to_rtd(substream);
 	struct snd_card *card = substream->pcm->card;
 	struct loongson_runtime_data *prtd;
 	struct loongson_dma_data *dma_data;