[PATCH] dix: In MakeWindowOptional: Fix crash if parentOptional->cursor is NULL.

[Keith Packard]

Excerpts from Peter Hutterer's message of Sun Sep 27 16:28:24 -0700 2009:

> try testing with -noreset, as Julien said the regeneration support was
> busted in the driver. If you see crashes that happen outside of a regen,
> that'd be serious.

I tested 1.6 and 1.7 with the intel driver and fixed a bunch of reset
issues (mostly memory leaks), including this crasher. Should be fixed
in the Q3 release (due out shortly).
-- 
keith.packard at intel.com