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Trying to change the pointer control settings on a device without PtrFeedbackPtr would be a bug and a crash in the Xserver. Guard against that case by returning early with a BadImplementation error, that might kill the X11 client but the Xserver would survive. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net> Related: xorg/xserver#1137 (cherry picked from commit dee2bb03)
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