xorg-x11-server: Use-after-free bug in DamageDestroy

A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration a multi-screen setup with multiple protocol screens, also known as Zaphod mode. If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be...