fixed small bug with AUDIO_ENABLED (#339)

quantum/quantum.c

@@ -435,28 +435,29 @@ void matrix_scan_quantum() {
 
   matrix_scan_kb();
 }
+#ifdef AUDIO_ENABLE
+  bool is_music_on(void) {
+      return (music_activated != 0);
+  }
 
-bool is_music_on(void) {
-    return (music_activated != 0);
-}
-
-void music_toggle(void) {
-    if (!music_activated) {
-        music_on();
-    } else {
-        music_off();
-    }
-}
+  void music_toggle(void) {
+      if (!music_activated) {
+          music_on();
+      } else {
+          music_off();
+      }
+  }
 
-void music_on(void) {
-    music_activated = 1;
-    music_on_user();
-}
+  void music_on(void) {
+      music_activated = 1;
+      music_on_user();
+  }
 
-void music_off(void) {
-    music_activated = 0;
-    stop_all_notes();
-}
+  void music_off(void) {
+      music_activated = 0;
+      stop_all_notes();
+  }
 
+#endif
 __attribute__ ((weak))
 void music_on_user() {}