add check to reuse the current RWMutex if it already exists.

Author: joeybloggs

README.md

@@ -1,6 +1,6 @@
 ##LARS
 <img align="right" src="https://raw.githubusercontent.com/go-playground/lars/master/examples/README/test.gif">
-![Project status](https://img.shields.io/badge/version-2.4-green.svg)
+![Project status](https://img.shields.io/badge/version-2.4.1-green.svg)
 [![Build Status](https://semaphoreci.com/api/v1/projects/4351aa2d-2f94-40be-a6ef-85c248490378/679708/badge.svg)](https://semaphoreci.com/joeybloggs/lars)
 [![Coverage Status](https://coveralls.io/repos/github/go-playground/lars/badge.svg?branch=master)](https://coveralls.io/github/go-playground/lars?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/go-playground/lars)](https://goreportcard.com/report/go-playground/lars)

context.go

@@ -182,7 +182,11 @@ func (c *Ctx) ParseMultipartForm(maxMemory int64) error {
 func (c *Ctx) Set(key string, value interface{}) {
 
 	if c.store == nil {
-		c.m = new(sync.RWMutex)
+
+		if c.m == nil {
+			c.m = new(sync.RWMutex)
+		}
+
 		c.m.Lock()
 		c.store = make(store)
 	} else {