Fix potential null accesses

sway/commands/move.c

@@ -311,6 +311,7 @@ static bool container_move_in_direction(struct sway_container *container,
 
 	while (current) {
 		list_t *siblings = container_get_siblings(current);
+		if (siblings) {
 			enum sway_container_layout layout = container_parent_layout(current);
 			int index = list_find(siblings, current);
 			int desired = index + offs;
@@ -344,12 +345,14 @@ static bool container_move_in_direction(struct sway_container *container,
 					return true;
 				}
 			}
+		}
 
 		current = current->parent;
 	}
 
 	// Maybe rejigger the workspace
 	struct sway_workspace *ws = container->workspace;
+	if (ws) {
 		if (!is_parallel(ws->layout, move_dir)) {
 			workspace_rejigger(ws, container, move_dir);
 			return true;
@@ -370,6 +373,7 @@ static bool container_move_in_direction(struct sway_container *container,
 			return true;
 		}
 		sway_log(SWAY_DEBUG, "Hit edge of output, nowhere else to go");
+	}
 	return false;
 }
 

sway/input/seat.c

@@ -1194,6 +1194,7 @@ void seat_consider_warp_to_focus(struct sway_seat *seat) {
 	}
 	if (config->mouse_warping == WARP_OUTPUT) {
 		struct sway_output *output = node_get_output(focus);
+		if (output) {
 			struct wlr_box box;
 			output_get_box(output, &box);
 			if (wlr_box_contains_point(&box,
@@ -1201,6 +1202,7 @@ void seat_consider_warp_to_focus(struct sway_seat *seat) {
 				return;
 			}
 		}
+	}
 
 	if (focus->type == N_CONTAINER) {
 		cursor_warp_to_container(seat->cursor, focus->sway_container);