Verified that audio has been initialized before playing sounds or ticking audio.

src/libsm64.c

@@ -144,6 +144,11 @@ SM64_LIB_FN void sm64_audio_init( uint8_t *rom ) {
 #define SAMPLES_LOW 528
 
 extern SM64_LIB_FN uint32_t sm64_audio_tick( uint32_t numQueuedSamples, uint32_t numDesiredSamples, int16_t *audio_buffer ) {
+    if ( !is_audio_initialized ) {
+        DEBUG_PRINT("Attempted to tick audio, but sm64_audio_init() has not been called yet.");
+        return 0;
+    }
+    
     update_game_sound();
 	
     u32 num_audio_samples = numQueuedSamples < numDesiredSamples ? SAMPLES_HIGH : SAMPLES_LOW;