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glx: Do not call into Composite if it is disabled.

Ignacio Casal requested to merge nacho.resa/xserver:server-1.19-branch into server-1.19-branch

Otherwise X server crashes if GLX is enabled and Composite disabled. For example the compIsAlternateVisual function will try to lookup CompScreenPtr using the CompScreenPrivateKey, but that was never initialized if Composite is disabled.

Fixes: f84e59a4. ("glx: Duplicate relevant fbconfigs for compositing visuals") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104993 Signed-off-by: Michal Srb msrb@suse.com

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