minor simplification

Author: dunglas

src/net/http/httputil/reverseproxy.go

@@ -318,7 +318,7 @@ func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 			rw.WriteHeader(code)
 
 			// Clear headers, it's not automatically done by ResponseWriter.WriteHeader() for 1xx responses
-			for k, _ := range h {
+			for k := range h {
 				delete(h, k)
 			}