[42] wayland: Skip subsurface desync if parent is NULL
In order to avoid crashes when a client already destroyed the parent wl_surface.
Part-of: !2917 (merged)
(cherry picked from commit 76ce6a0a)
In order to avoid crashes when a client already destroyed the parent wl_surface.
Part-of: !2917 (merged)
(cherry picked from commit 76ce6a0a)