There's no need to SDL_PauseAudio(1) before calling SDL_CloseAudio().

code/sdl/sdl_snd.c

@@ -262,7 +262,6 @@ SNDDMA_Shutdown
 void SNDDMA_Shutdown(void)
 {
 	Com_Printf("Closing SDL audio device...\n");
-	SDL_PauseAudio(1);
 	SDL_CloseAudio();
 	SDL_QuitSubSystem(SDL_INIT_AUDIO);
 	free(dma.buffer);