[PATCH] remove damagePostOp() from DamageDamageRegion()

[Maarten Maathuis]

This is a patch based on a suggestion by Michael Danzer, because it's
non-trivial i'm posting it first. The idea is that PostOp only needs
to be called after doing an actual rendering operation. Please voice
any concerns you might have.

I CC'ed Aaron Plattner because "he" might be the only out of tree user
of this symbol.

Maarten.
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