d326d32e24
Avoid a NULL-pointer dereference.
Fixes: 2c8a85b712 ("glx: Stash a copy of the XExtCodes in the glx_display")
Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12751>