sound: Use static const char * const where possible

Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/core/pcm_native.c

@@ -142,7 +142,7 @@ int snd_pcm_info_user(struct snd_pcm_substream *substream,
 
 #ifdef RULES_DEBUG
 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
-char *snd_pcm_hw_param_names[] = {
+static const char * const snd_pcm_hw_param_names[] = {
 	HW_PARAM(ACCESS),
 	HW_PARAM(FORMAT),
 	HW_PARAM(SUBFORMAT),