/*
 * call-seq:
 *   easy.ftp_entry_path                                => "C:\ftp\root\" or nil
 *
 * Retrieve the path of the entry path. That is the initial path libcurl ended
 * up in when logging on to the remote FTP server. This returns +nil+ if
 * something is wrong.
 *
 * (requires libcurl 7.15.4 or higher, otherwise +nil+ is always returned).
 */
static VALUE ruby_curl_easy_ftp_entry_path_get(VALUE self) {