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	FreeVisualInfo -- return any resources taken by GetVisualInfo. (V36)

	FreeVisualInfo(vi)
	               A0
	VOID FreeVisualInfo(APTR);

	FreeVisualInfo() returns any memory or other resources that
	were allocated by GetVisualInfoA().  You should only call this function
	once you are done with using the gadgets (i.e. after CloseWindow()),
	but while the screen is still valid (i.e. before CloseScreen() or
	UnlockPubScreen()).

	vi - pointer that was obtained by calling GetVisualInfoA(). This
	     value may be NULL.