port fix for mkdirp issue jprichardson#111

The original mkdirp mis-handles the fourth parameter when a directory
component is missing.  The same issue is present in the fs-extra
variant.

See: https://github.com/substack/node-mkdirp/issues/111
Signed-off-by: Peter A. Bigot <pab@pabigot.com>

lib/mkdirs/mkdirs.js

@@ -40,7 +40,7 @@ function mkdirs (p, opts, callback, made) {
         mkdirs(path.dirname(p), opts, function (er, made) {
           if (er) callback(er, made)
           else mkdirs(p, opts, callback, made)
-        })
+        }, made)
         break
 
       // In the case of any other error, just see if there's a dir