Fix config.h

engine/config.h

@@ -22,7 +22,7 @@
 #	endif // CROWN_SOUND_OPENSLES
 
 #	ifndef CROWN_SOUND_NULL
-#		define CROWN_SOUND_NULL
+#		define CROWN_SOUND_NULL (!(CROWN_SOUND_OPENAL || CROWN_SOUND_OPENSLES))
 #	endif // CROWN_SOUND_NULL
 #else
 #	ifndef CROWN_SOUND_OPENAL