https://bugs.gentoo.org/944388

The comment for clearSoundBuffer() makes clear it uses the global soundCache,
as do the other functions that operate on it.
--- a/src/ag.c
+++ b/src/ag.c
@@ -1772,7 +1772,7 @@ struct sprite* letters = NULL;
 	// tidy up and exit
 	free(rootWord);
 	Mix_CloseAudio();
-	clearSoundBuffer(&soundCache);
+	clearSoundBuffer();
 	//trashDLBTree();
 	destroyLetters(&letters);
 	SDL_FreeSurface(screen);