fix(fs): return after calling cb in chmod (#33)

Author: jchip

lib/node/fs.js

@@ -431,7 +431,7 @@ function overrideNode () {
 
   patchFn('chmod', chmod => (p, mode, cb) => {
     return chmod(p, mode, (err) => {
-      if (!err || err.code !== 'ENOENT') { cb(err) }
+      if (!err || err.code !== 'ENOENT') { return cb(err) }
 
       const resolved = pkglock.resolve(p)
       if (!resolved) {
@@ -441,9 +441,9 @@ function overrideNode () {
       }
 
       return mkdirp(path.dirname(p), err => {
-        if (err) { cb(err) }
+        if (err) { return cb(err) }
         fs.readFile(p, (err, data) => {
-          if (err) { cb(err) }
+          if (err) { return cb(err) }
           fs.writeFile(p, data, { mode }, cb)
         })
       })