- Fix memory leak in DMA sound after S_Shutdown()

- Make codec load use temp hunk memory instead of zone mem
- Fix sound issues with direct sound and game_restart (#4526)

code/null/null_client.c

@@ -85,7 +85,7 @@ void CL_FlushMemory( void ) {
 void CL_StartHunkUsers( qboolean rendererOnly ) {
 }
 
-void CL_Snd_Restart(void)
+void CL_Snd_Shutdown(void)
 {
 }