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xfree86: Fix NULL pointer dereference crash

Zoltán Böszörményi requested to merge zboszor/xserver:fix-crash-if-no-virtual-1.20 into server-1.20-branch

screenp->displays[count] (passed to configDisplay() in configScreen()) is NULL if there is no Virtual setting in the configuration.

Fixes: a4210fe0 ("xfree86: Change displays array to pointers array to fix invalid pointer issues after table reallocation")

Signed-off-by: Zoltán Böszörményi zboszor@gmail.com

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