Merge on current master

api.go

@@ -484,7 +484,6 @@ func postImagesInsert(srv *Server, version float64, w http.ResponseWriter, r *ht
 }
 
 func postImagesPush(srv *Server, version float64, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
-	authConfig := &auth.AuthConfig{}
 	metaHeaders := map[string][]string{}
 	for k, v := range r.Header {
 		if strings.HasPrefix(k, "X-Meta-") {