[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>
diff --git a/sound/pci/ice1712/pontis.c b/sound/pci/ice1712/pontis.c
index 4945c81..203cdc1bf 100644
--- a/sound/pci/ice1712/pontis.c
+++ b/sound/pci/ice1712/pontis.c
@@ -246,7 +246,7 @@
 		wm_put(ice, WM_ADC_MUX, nval);
 	}
 	mutex_unlock(&ice->gpio_mutex);
-	return 0;
+	return change;
 }
 
 /*
@@ -450,7 +450,7 @@
 		change = 1;
 	}
 	mutex_unlock(&ice->gpio_mutex);
-	return 0;
+	return change;
 }