Fix a fine point in this test-case: We can get a Content-Length on

a 304 response, but we still don't get the body.

bin/varnishtest/tests/c00008.vtc

@@ -25,13 +25,13 @@ client c1 {
 
 	txreq -url "/foo" \
 	    -hdr "If-Modified-Since: Thu, 26 Jun 2008 12:00:01 GMT"
-	rxresp
+	rxresp -no_obj
 	expect resp.status == 304
 	expect resp.http.etag == "foo"
 
 	txreq -url "/foo" \
 	    -hdr "If-Modified-Since: Thu, 26 Jun 2008 12:00:02 GMT"
-	rxresp
+	rxresp -no_obj
 	expect resp.status == 304
 	expect resp.http.etag == "foo"
 }