Add documenting asserts

bin/varnishd/cache/cache_fetch.c

@@ -250,6 +250,9 @@ vbf_stp_mkbereq(struct worker *wrk, struct busyobj *bo)
 		HSH_Ref(bo->bereq_body);
 		bo->req = NULL;
 		ObjSetState(bo->wrk, bo->fetch_objcore, BOS_REQ_DONE);
+	} else if (bo->req->req_body_status != REQ_BODY_WITH_LEN &&
+	    bo->req->req_body_status != REQ_BODY_WITHOUT_LEN) {
+		WRONG("Bad req_body_status");
 	}
 	return (F_STP_STARTFETCH);
 }

bin/varnishd/http1/cache_http1_fetch.c

@@ -107,6 +107,7 @@ V1F_SendReq(struct worker *wrk, struct busyobj *bo, uint64_t *ctr_hdrbytes,
 	i = 0;
 
 	if (bo->bereq_body != NULL) {
+		AZ(bo->req);
 		if (do_chunked)
 			V1L_Chunked(wrk);
 		(void)ObjIterate(bo->wrk, bo->bereq_body,