More linting in src/sound

src/sound/sound.c

@@ -196,7 +196,7 @@ sound_card_has_config(int card)
     return device_has_config(sound_cards[card].device) ? 1 : 0;
 }
 
-char *
+const char *
 sound_card_get_internal_name(int card)
 {
     return device_get_internal_name(sound_cards[card].device);