ALSA: sound/isa: 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/isa/gus/gus_main.c

@@ -82,7 +82,7 @@ static int snd_gus_joystick_put(struct snd_kcontrol *kcontrol, struct snd_ctl_el
 	return change;
 }
 
-static struct snd_kcontrol_new snd_gus_joystick_control = {
+static const struct snd_kcontrol_new snd_gus_joystick_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
 	.name = "Joystick Speed",
 	.info = snd_gus_joystick_info,

sound/isa/gus/gus_pcm.c

@@ -809,7 +809,7 @@ static int snd_gf1_pcm_volume_put(struct snd_kcontrol *kcontrol, struct snd_ctl_
 	return change;
 }
 
-static struct snd_kcontrol_new snd_gf1_pcm_volume_control =
+static const struct snd_kcontrol_new snd_gf1_pcm_volume_control =
 {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "PCM Playback Volume",
@@ -818,7 +818,7 @@ static struct snd_kcontrol_new snd_gf1_pcm_volume_control =
 	.put = snd_gf1_pcm_volume_put
 };
 
-static struct snd_kcontrol_new snd_gf1_pcm_volume_control1 =
+static const struct snd_kcontrol_new snd_gf1_pcm_volume_control1 =
 {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "GPCM Playback Volume",