ALSA: aoa: Constify snd_device_ops definitions

Now we may declare const for snd_device_ops definitions, so let's do
it for optimization.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-12-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/aoa/aoa.h

@@ -116,7 +116,7 @@ struct aoa_card {
 };
         
 extern int aoa_snd_device_new(enum snd_device_type type,
-	void * device_data, struct snd_device_ops * ops);
+	void *device_data, const struct snd_device_ops *ops);
 extern struct snd_card *aoa_get_card(void);
 extern int aoa_snd_ctl_add(struct snd_kcontrol* control);
 

sound/aoa/codecs/onyx.c

@@ -97,7 +97,7 @@ static int onyx_dev_register(struct snd_device *dev)
 	return 0;
 }
 
-static struct snd_device_ops ops = {
+static const struct snd_device_ops ops = {
 	.dev_register = onyx_dev_register,
 };
 

sound/aoa/codecs/tas.c

@@ -217,7 +217,7 @@ static int tas_dev_register(struct snd_device *dev)
 	return 0;
 }
 
-static struct snd_device_ops ops = {
+static const struct snd_device_ops ops = {
 	.dev_register = tas_dev_register,
 };
 

sound/aoa/codecs/toonie.c

@@ -30,7 +30,7 @@ static int toonie_dev_register(struct snd_device *dev)
 	return 0;
 }
 
-static struct snd_device_ops ops = {
+static const struct snd_device_ops ops = {
 	.dev_register = toonie_dev_register,
 };
 

sound/aoa/core/alsa.c

@@ -59,7 +59,7 @@ void aoa_alsa_cleanup(void)
 }
 
 int aoa_snd_device_new(enum snd_device_type type,
-		       void * device_data, struct snd_device_ops * ops)
+		       void *device_data, const struct snd_device_ops *ops)
 {
 	struct snd_card *card = aoa_get_card();
 	int err;