fix for the failing case

Author: James Halliday

lib/async.js

@@ -104,7 +104,7 @@ module.exports = function resolve (x, opts, cb) {
 
         var pkgfile = path.join(dir, 'package.json');
         isFile(pkgfile, function (err, ex) {
-            if (err) return cb(err);
+            // on err, ex is false
             if (!ex) return loadpkg(
                 dir.replace(/[\\\/]*[^\\\/]+[\\\/]*/, ''), cb
             );