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dix: dixutils: make workQueue pointer dix-private

Enrico Weigelt, metux IT consult . requested to merge metux/xserver:submit/dix-workqueue into master

The workQueue pointer is currently declared extern, so that WaitForSomething() can check wether we've got something in the queue and call ProcessWorkQueue() then.

But that's trivial to simplify: just let ProcessWorkQueue() return early if workQueue == NULL. Gives us a better isolation of internal stuff as well as ProcessWorkQueue() protecting itself from possible segfault.

Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net

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