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] https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/3991

include/wlr/types/wlr_scene.h

@@ -302,7 +302,7 @@ struct wlr_scene_buffer *wlr_scene_buffer_from_node(struct wlr_scene_node *node)
  * If this buffer is backed by a surface, then the struct wlr_scene_surface is
  * returned. If not, NULL will be returned.
  */
-struct wlr_scene_surface *wlr_scene_surface_from_buffer(
+struct wlr_scene_surface *wlr_scene_surface_try_from_buffer(
 	struct wlr_scene_buffer *scene_buffer);
 
 /**

tinywl/tinywl.c

@@ -348,7 +348,7 @@ static struct tinywl_view *desktop_view_at(
 	}
 	struct wlr_scene_buffer *scene_buffer = wlr_scene_buffer_from_node(node);
 	struct wlr_scene_surface *scene_surface =
-		wlr_scene_surface_from_buffer(scene_buffer);
+		wlr_scene_surface_try_from_buffer(scene_buffer);
 	if (!scene_surface) {
 		return NULL;
 	}

types/scene/surface.c

@@ -128,7 +128,7 @@ static void handle_scene_surface_surface_commit(
 static bool scene_buffer_point_accepts_input(struct wlr_scene_buffer *scene_buffer,
 		int sx, int sy) {
 	struct wlr_scene_surface *scene_surface =
-		wlr_scene_surface_from_buffer(scene_buffer);
+		wlr_scene_surface_try_from_buffer(scene_buffer);
 
 	return wlr_surface_point_accepts_input(scene_surface->surface, sx, sy);
 }
@@ -155,7 +155,7 @@ static const struct wlr_addon_interface surface_addon_impl = {
 	.destroy = surface_addon_destroy,
 };
 
-struct wlr_scene_surface *wlr_scene_surface_from_buffer(
+struct wlr_scene_surface *wlr_scene_surface_try_from_buffer(
 		struct wlr_scene_buffer *scene_buffer) {
 	struct wlr_addon *addon = wlr_addon_find(&scene_buffer->node.addons,
 		scene_buffer, &surface_addon_impl);