wlr_{box, fbox}_equal: Handle NULL

util/box.c

@@ -175,11 +175,19 @@ void wlr_fbox_transform(struct wlr_fbox *dest, const struct wlr_fbox *box,
 #ifdef WLR_USE_UNSTABLE
 
 bool wlr_box_equal(const struct wlr_box *a, const struct wlr_box *b) {
+	if (a == NULL || b == NULL) {
+		return a == b;
+	}
+
 	return a->x == b->x && a->y == b->y &&
 		a->width == b->width && a->height == b->height;
 }
 
 bool wlr_fbox_equal(const struct wlr_fbox *a, const struct wlr_fbox *b) {
+	if (a == NULL || b == NULL) {
+		return a == b;
+	}
+
 	return a->x == b->x && a->y == b->y &&
 		a->width == b->width && a->height == b->height;
 }