ALSA: mixart: constify snd_kcontrol_new structures

Declare snd_kcontrol_new structures as const as they are only passed an
argument to the function snd_ctl_new1. This argument is of type const,
so snd_kcontrol_new structures having this property can be made const.
Done using Coccinelle:

@r disable optional_qualifier@
identifier x;
position p;
@@
static struct snd_kcontrol_new x@p={...};

@ok@
identifier r.x;
position p;
@@
snd_ctl_new1(&x@p,...)

@bad@
position p != {r.p,ok.p};
identifier r.x;
@@
x@p

@depends on !bad disable optional_qualifier@
identifier r.x;
@@
+const
struct snd_kcontrol_new x;

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/mixart/mixart_mixer.c

@@ -404,7 +404,7 @@ static int mixart_analog_vol_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
 
 static const DECLARE_TLV_DB_SCALE(db_scale_analog, -9600, 50, 0);
 
-static struct snd_kcontrol_new mixart_control_analog_level = {
+static const struct snd_kcontrol_new mixart_control_analog_level = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
 		   SNDRV_CTL_ELEM_ACCESS_TLV_READ),
@@ -897,7 +897,7 @@ static int mixart_pcm_vol_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem
 
 static const DECLARE_TLV_DB_SCALE(db_scale_digital, -10950, 50, 0);
 
-static struct snd_kcontrol_new snd_mixart_pcm_vol =
+static const struct snd_kcontrol_new snd_mixart_pcm_vol =
 {
 	.iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
@@ -951,7 +951,7 @@ static int mixart_pcm_sw_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_
 	return changed;
 }
 
-static struct snd_kcontrol_new mixart_control_pcm_switch = {
+static const struct snd_kcontrol_new mixart_control_pcm_switch = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	/* name will be filled later */
 	.count =        MIXART_PLAYBACK_STREAMS,