wlr_scene: Rename wlr_scene_surface_from_buffer
This renames it to wlr_scene_surface_try_from_buffer to be more clear that this function can return NULL. This is inline with the rest of wlroots[1].
[1] !3991 (merged)
This renames it to wlr_scene_surface_try_from_buffer to be more clear that this function can return NULL. This is inline with the rest of wlroots[1].
[1] !3991 (merged)