[ALSA] Clean up with common snd_ctl_boolean_*_info callbacks

Clean up codes using the new common snd_ctl_boolean_*_info() callbacks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
index 71d7aab..0dc69d0 100644
--- a/sound/pci/cs46xx/cs46xx_lib.c
+++ b/sound/pci/cs46xx/cs46xx_lib.c
@@ -1818,15 +1818,7 @@
 }
 #endif
 
-static int snd_mixer_boolean_info(struct snd_kcontrol *kcontrol, 
-				  struct snd_ctl_elem_info *uinfo)
-{
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
-	uinfo->count = 1;
-	uinfo->value.integer.min = 0;
-	uinfo->value.integer.max = 1;
-	return 0;
-}
+#define snd_mixer_boolean_info		snd_ctl_boolean_mono_info
 
 static int snd_cs46xx_iec958_get(struct snd_kcontrol *kcontrol, 
                                  struct snd_ctl_elem_value *ucontrol)