ASoC: twl4030: 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 <[e-mail]>
Acked-by: Peter Ujfalusi <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/soc/codecs/twl4030.c

···
 		return;
 
 	/* Set the constraints according to the already configured stream */
-	snd_pcm_hw_constraint_minmax(slv_substream->runtime,
+	snd_pcm_hw_constraint_single(slv_substream->runtime,
 				SNDRV_PCM_HW_PARAM_RATE,
-				twl4030->rate,
 				twl4030->rate);
 
-	snd_pcm_hw_constraint_minmax(slv_substream->runtime,
+	snd_pcm_hw_constraint_single(slv_substream->runtime,
 				SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
-				twl4030->sample_bits,
 				twl4030->sample_bits);
 
-	snd_pcm_hw_constraint_minmax(slv_substream->runtime,
+	snd_pcm_hw_constraint_single(slv_substream->runtime,
 				SNDRV_PCM_HW_PARAM_CHANNELS,
-				twl4030->channels,
 				twl4030->channels);
 }
 
···
 			/* In option2 4 channel is not supported, set the
 			 * constraint for the first stream for channels, the
 			 * second stream will 'inherit' this cosntraint */
-			snd_pcm_hw_constraint_minmax(substream->runtime,
+			snd_pcm_hw_constraint_single(substream->runtime,
 						     SNDRV_PCM_HW_PARAM_CHANNELS,
-						     2, 2);
+						     2);
 		}
 		twl4030->master_substream = substream;
 	}