window: Plug leak of shm_surface_data on shm_suface_data_destroy()
window: Plug leak of shm_surface_data on shm_suface_data_destroy()

This was causing a leak on every frame when using shm buffers.

kwm81/weston,giucam/weston,sir-murray/weston,Gnurou/weston,Fantu/compositor-spice,Gnurou/weston,kwm81/weston,udoprog/weston,xorgy/weston,krezovic/weston,Fantu/compositor-spice,udoprog/weston,jonnylamb/weston,krezovic/weston,Tarnyko/weston-xdg_surface_present,mchalupa/weston,sir-murray/weston,Tarnyko/weston-xdg_surface_present,jonnylamb/weston,Fantu/compositor-spice,eyolfson/weston,eyolfson/weston,xorgy/weston,mchalupa/weston,giucam/weston