[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/es1938.c b/sound/pci/es1938.c
index fec29a1..fc686db 100644
--- a/sound/pci/es1938.c
+++ b/sound/pci/es1938.c
@@ -1066,15 +1066,7 @@
 	return snd_es1938_mixer_bits(chip, 0x1c, 0x07, val) != val;
 }
 
-static int snd_es1938_info_spatializer_enable(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_es1938_info_spatializer_enable	snd_ctl_boolean_mono_info
 
 static int snd_es1938_get_spatializer_enable(struct snd_kcontrol *kcontrol,
 					     struct snd_ctl_elem_value *ucontrol)
@@ -1120,15 +1112,7 @@
 	return 0;
 }
 
-static int snd_es1938_info_hw_switch(struct snd_kcontrol *kcontrol,
-				     struct snd_ctl_elem_info *uinfo)
-{
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
-	uinfo->count = 2;
-	uinfo->value.integer.min = 0;
-	uinfo->value.integer.max = 1;
-	return 0;
-}
+#define snd_es1938_info_hw_switch		snd_ctl_boolean_stereo_info
 
 static int snd_es1938_get_hw_switch(struct snd_kcontrol *kcontrol,
 				    struct snd_ctl_elem_value *ucontrol)