Handle the vulnerability in black duck report

Change-Id: Id4b96e8a25b14dbe057fc3595a9265fdda16622e
diff --git a/vendor/github.com/gorilla/mux/regexp.go b/vendor/github.com/gorilla/mux/regexp.go
index 0144842..5d05cfa 100644
--- a/vendor/github.com/gorilla/mux/regexp.go
+++ b/vendor/github.com/gorilla/mux/regexp.go
@@ -22,10 +22,10 @@
 type regexpType int
 
 const (
-	regexpTypePath   regexpType = 0
-	regexpTypeHost   regexpType = 1
-	regexpTypePrefix regexpType = 2
-	regexpTypeQuery  regexpType = 3
+	regexpTypePath regexpType = iota
+	regexpTypeHost
+	regexpTypePrefix
+	regexpTypeQuery
 )
 
 // newRouteRegexp parses a route template and returns a routeRegexp,
@@ -195,7 +195,7 @@
 
 // url builds a URL part using the given values.
 func (r *routeRegexp) url(values map[string]string) (string, error) {
-	urlValues := make([]interface{}, len(r.varsN), len(r.varsN))
+	urlValues := make([]interface{}, len(r.varsN))
 	for k, v := range r.varsN {
 		value, ok := values[v]
 		if !ok {