Revert some earlier test code.

research/ma_engine.c

@@ -34,7 +34,7 @@ int main(int argc, char** argv)
 
 
 #if 1
-    result = ma_engine_sound_init_from_file(&engine, /*argv[1]*/ "unknownfile.wav", MA_DATA_SOURCE_FLAG_DECODE | MA_DATA_SOURCE_FLAG_ASYNC | MA_DATA_SOURCE_FLAG_STREAM, NULL, &sound);
+    result = ma_engine_sound_init_from_file(&engine, argv[1], MA_DATA_SOURCE_FLAG_DECODE | MA_DATA_SOURCE_FLAG_ASYNC | MA_DATA_SOURCE_FLAG_STREAM, NULL, &sound);
     if (result != MA_SUCCESS) {
         ma_engine_uninit(&engine);
         return -1;