Previously we assumed every pixmap destroyed during a software fallback was also created during a software fallback and had access prepared, but that's not always true. Fixes a server abort Reported-by: 邓逸昕 <bupt.dengyixin@gmail.com> Signed-off-by: Michel Dänzer <daenzer@vmware.com> Acked-by: Maarten Maathuis <madman2003@gmail.com> Signed-off-by: Keith Packard <keithp@keithp.com>