remove a racy assertion

this was intended to weed out additional errors, but right after the
set_closed & unluck, the topreq thread may deliver our node

src/vdp_pesi.c

@@ -945,11 +945,6 @@ ved_task(struct worker *wrk, void *priv)
 		Lck_Lock(&pesi_tree->tree->tree_lock);
 		set_closed(pesi_tree->tree, node);
 		Lck_Unlock(&pesi_tree->tree->tree_lock);
-
-		if (VSTAILQ_EMPTY(&node->nexus.children))
-			assert(node->state == ST_DELIVERED);
-		else
-			assert(node->state == ST_CLOSED);
 		break;
 	default:
 		INCOMPL();