Adjust to VDP API Changes from VC#4035

Ref https://github.com/varnishcache/varnish-cache/pull/4035

src/vmod_re.c

@@ -1489,20 +1489,23 @@ re_vfp_fini(struct vfp_ctx *vc, struct vfp_entry *vfe)
 	(type *)((char *)__mptr - offsetof(type, member)) ; })
 
 static int v_matchproto_(vdp_init_f)
-re_vdp_init(VRT_CTX, struct vdp_ctx *vdx, void **priv, struct objcore *oc)
+re_vdp_init(VRT_CTX, struct vdp_ctx *vdc, void **priv,
+    struct objcore *oc, struct req *req,
+    struct http *hd, intmax_t *cl)
 {
 	const struct vmod_re_regex *re;
 	struct vdp_container *vdpc;
 	struct re_flt_state *res;
 	struct vdp_entry *vde;
 	struct vmod_priv *task;
-	struct req *req;
 
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
-	CHECK_OBJ_NOTNULL(vdx, VDP_CTX_MAGIC);
+	CHECK_OBJ_NOTNULL(vdc, VDP_CTX_MAGIC);
+	AN(priv);
 	CHECK_OBJ_ORNULL(oc, OBJCORE_MAGIC);
-	req = vdx->req;
-	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+	CHECK_OBJ_ORNULL(req, REQ_MAGIC);
+	CHECK_OBJ_NOTNULL(hd, HTTP_MAGIC);
+	AN(cl);
 
 	/*
 	 * making a mountain out of a molehill because we do not
@@ -1531,7 +1534,7 @@ re_vdp_init(VRT_CTX, struct vdp_ctx *vdx, void **priv, struct objcore *oc)
 	AZ(*priv);
 	*priv = res;
 
-	req->resp_len = -1;
+	*cl = -1;
 
 	return (0);
 }