ASoC: pcm: Use snd_pcm_hw_constraint_single()

Use the new snd_pcm_hw_constraint_single() helper function instead of
calling snd_pcm_hw_constraint_minmax() with the same value for min and max
to install a constraint that limits the possible configuration values to a
single value. Using snd_pcm_hw_constraint_single() makes the indented
result clearer and is slightly shorter.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/soc-pcm.c

@@ -182,9 +182,9 @@ static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
 				soc_dai->rate);
 
-		ret = snd_pcm_hw_constraint_minmax(substream->runtime,
+		ret = snd_pcm_hw_constraint_single(substream->runtime,
 						SNDRV_PCM_HW_PARAM_RATE,
-						soc_dai->rate, soc_dai->rate);
+						soc_dai->rate);
 		if (ret < 0) {
 			dev_err(soc_dai->dev,
 				"ASoC: Unable to apply rate constraint: %d\n",
@@ -198,9 +198,8 @@ static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
 				soc_dai->channels);
 
-		ret = snd_pcm_hw_constraint_minmax(substream->runtime,
+		ret = snd_pcm_hw_constraint_single(substream->runtime,
 						SNDRV_PCM_HW_PARAM_CHANNELS,
-						soc_dai->channels,
 						soc_dai->channels);
 		if (ret < 0) {
 			dev_err(soc_dai->dev,
@@ -215,9 +214,8 @@ static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
 		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
 				soc_dai->sample_bits);
 
-		ret = snd_pcm_hw_constraint_minmax(substream->runtime,
+		ret = snd_pcm_hw_constraint_single(substream->runtime,
 						SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
-						soc_dai->sample_bits,
 						soc_dai->sample_bits);
 		if (ret < 0) {
 			dev_err(soc_dai->dev,