dri2: avoid crash with old dri drivers.
I built latest server and copied over a mesa 7.8 dri2 driver to use with it, and it crashed in here starting compiz. Looks like we need to validate the flush extension is registered before calling invalidate. Signed-off-by: Dave Airlie <airlied@redhat.com> Reviewed-by: Michel Dänzer <michel@daenzer.net> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Keith Packard <keithp@keithp.com>
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@ -435,6 +435,7 @@ __glXDRIinvalidateBuffers(DrawablePtr pDraw, void *priv)
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__GLXDRIdrawable *private = priv;
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__GLXDRIscreen *screen = private->screen;
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if (screen->flush)
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(*screen->flush->invalidate)(private->driDrawable);
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#endif
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}
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