readline: avoid using forEach

PR-URL: https://github.com/nodejs/node/pull/11582
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

lib/readline.js

@@ -392,9 +392,8 @@ Interface.prototype._normalWrite = function(b) {
     // either '' or (conceivably) the unfinished portion of the next line
     string = lines.pop();
     this._line_buffer = string;
-    lines.forEach(function(line) {
-      this._onLine(line);
-    }, this);
+    for (var n = 0; n < lines.length; n++)
+      this._onLine(lines[n]);
   } else if (string) {
     // no newlines this time, save what we have for next time
     this._line_buffer = string;