curl_formfree() is used to clean up data previously built/appended with
curl_formadd(3). This must be called when the data has been used, which
typically means after curl_easy_perform(3) has been called.
The pointer to free is the same pointer you passed to the
CURLOPT_HTTPPOST(3) option, which is the firstitem pointer from
the curl_formadd(3) invoke(s).
form is the pointer as returned from a previous call to
curl_formadd(3) and may be NULL.