[ALSA] ice1724 - Fix return codes in some pointis callbacks

Fixed the return codes (1 for changed values) in put callbacks of
pontis.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/pontis.c

@@ -246,7 +246,7 @@ static int wm_adc_mux_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_val
 		wm_put(ice, WM_ADC_MUX, nval);
 	}
 	mutex_unlock(&ice->gpio_mutex);
-	return 0;
+	return change;
 }
 
 /*
@@ -450,7 +450,7 @@ static int cs_source_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_valu
 		change = 1;
 	}
 	mutex_unlock(&ice->gpio_mutex);
-	return 0;
+	return change;
 }