- Pawel Kierski pointed out a mistake in the cookie code that could lead to a

bad fclose() after a fatal error had occured.
  (http://curl.haxx.se/bug/view.cgi?id=2382219)

lib/cookie.c

@@ -1003,7 +1003,8 @@ int Curl_cookie_output(struct CookieInfo *c, const char *dumphere)
       format_ptr = get_netscape_format(co);
       if(format_ptr == NULL) {
         fprintf(out, "#\n# Fatal libcurl error\n");
-        fclose(out);
+        if(!use_stdout)
+          fclose(out);
         return 1;
       }
       fprintf(out, "%s\n", format_ptr);