non-ESI T_NEXUS buffering can also use nodes on ws

src/node.c

@@ -146,6 +146,9 @@ node_fill_nodestock(struct ws *ws, struct node_head *head)
 	unsigned spc, n;
 	void *p;
 
+	if (VSTAILQ_FIRST(head) != NULL)
+		return;
+
 	WS_Assert(ws);
 	AN(head);
 

src/vdp_pesi.c

@@ -472,8 +472,14 @@ vped_include(struct req *preq, const char *src, const char *host,
 static int v_matchproto_(vdp_init_f)
 pesi_buf_init(struct req *req, void **priv)
 {
-	(void)req;
-	(void)priv;
+	struct pesi *pesi;
+
+	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+	CAST_OBJ_NOTNULL(pesi, *priv, PESI_MAGIC);
+
+	WS_Assert_Allocated(req->ws, pesi, sizeof *pesi);
+	node_fill_nodestock(req->ws, &pesi->nodestock);
+
 	return (0);
 }