Merge pull request #889 from ipfs/fix/stop-stopped

fix: succeed when stopping already stopped

Author: daviddias

src/core/components/stop.js

@@ -1,12 +1,17 @@
 'use strict'
 
 const series = require('async/series')
+const setImmediate = require('async/setImmediate')
 
 module.exports = (self) => {
   return (callback) => {
     callback = callback || function noop () {}
     self.log('stop')
 
+    if (self.state.state() === 'stopped') {
+      return callback()
+    }
+
     const done = (err) => {
       if (err) {
         self.emit('error', err)