fix for radeon + opensource driver + kde effects = crash

The problem Kwin crashes when enabling opengl effects. It doesn’t crash immediately but it crashes after specific actions so it is 100% reproducible. For example when exiting from desktop-grid effect. The situation I’m using: Radeon 4870 graphics card (RV770) Kernel 3.1.5 (but seems irrelevant) Open source ATI driver with KMS using Gallium Xorg 1.11.2.902 (but …

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