ASoC: soc-core: remove OF adjusting for snd_soc_of_parse_audio_prefix

Because prototype of OF-graph sound card support didn't have Sound Card
node, commit b6defcca0a604129155ae472b116a2e1688d8995
("ASoC: soc-core: adjust for graph on snd_soc_of_parse_audio_prefix")
adjusted to it on each functions.

But final discussion result of ALSA SoC / OF-graph ML, OF-graph sound
card has node. Thus, this commit became no longer needed.

This reverts commit b6defcca0a604129155ae472b116a2e1688d8995.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 656a981..4ff2448 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3664,18 +3664,15 @@ int snd_soc_of_parse_tdm_slot(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);
 
-void snd_soc_of_parse_audio_prefix_from_node(struct snd_soc_card *card,
-				   struct device_node *np,
+void snd_soc_of_parse_audio_prefix(struct snd_soc_card *card,
 				   struct snd_soc_codec_conf *codec_conf,
 				   struct device_node *of_node,
 				   const char *propname)
 {
+	struct device_node *np = card->dev->of_node;
 	const char *str;
 	int ret;
 
-	if (!np)
-		np = card->dev->of_node;
-
 	ret = of_property_read_string(np, propname, &str);
 	if (ret < 0) {
 		/* no prefix is not error */
@@ -3685,7 +3682,7 @@ void snd_soc_of_parse_audio_prefix_from_node(struct snd_soc_card *card,
 	codec_conf->of_node	= of_node;
 	codec_conf->name_prefix	= str;
 }
-EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_prefix_from_node);
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_prefix);
 
 int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
 				   const char *propname)