ASoC: add for_each_dpcm_fe() macro

To be more readable code, this patch adds
new for_each_dpcm_fe() macro, and replace existing code to it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dpcm.h

@@ -103,6 +103,9 @@ struct snd_soc_dpcm_runtime {
 	int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
 };
 
+#define for_each_dpcm_fe(be, stream, dpcm)				\
+	list_for_each_entry(dpcm, &(be)->dpcm[stream].fe_clients, list_fe)
+
 /* can this BE stop and free */
 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
 		struct snd_soc_pcm_runtime *be, int stream);

sound/soc/soc-pcm.c

@@ -1252,7 +1252,7 @@ static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
 
 	be_substream = snd_soc_dpcm_get_substream(be, stream);
 
-	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
+	for_each_dpcm_fe(be, stream, dpcm) {
 		if (dpcm->fe == fe)
 			continue;
 
@@ -3219,7 +3219,7 @@ int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
 	struct snd_soc_dpcm *dpcm;
 	int state;
 
-	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
+	for_each_dpcm_fe(be, stream, dpcm) {
 
 		if (dpcm->fe == fe)
 			continue;
@@ -3246,7 +3246,7 @@ int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
 	struct snd_soc_dpcm *dpcm;
 	int state;
 
-	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
+	for_each_dpcm_fe(be, stream, dpcm) {
 
 		if (dpcm->fe == fe)
 			continue;