Michal Marek forwarded the bug report

https://bugzilla.novell.com/show_bug.cgi?id=332917 about a HTTP redirect to
FTP that caused memory havoc. His work together with my efforts created two
fixes:

#1 - FTP::file was moved to struct ftp_conn, because is has to be dealt with
     at connection cleanup, at which time the struct HandleData could be
     used by another connection.
     Also, the unused char *urlpath member is removed from struct FTP.

#2 - provide a Curl_reset_reqproto() function that frees
     data->reqdata.proto.* on connection setup if needed (that is if the
     SessionHandle was used by a different connection).

RELEASE-NOTES

@@ -40,6 +40,7 @@ This release includes the following bugfixes:
  o CURLOPT_POSTFIELDS could fail to send binary data
  o specifying a proxy with a trailing slash didn't work (unless it also
    contained a port number)
+ o redirect from HTTP to FTP memory problem
 
 This release includes the following known bugs: