Curl_done() and the protocol-specific conn->curl_done() functions now all

take a CURLcode as a second argument, that is non-zero when Curl_done()
is called after an error was returned from Curl_do() (or similar).

lib/telnet.c

@@ -1063,9 +1063,11 @@ void telrcv(struct connectdata *conn,
   }
 }
 
-CURLcode Curl_telnet_done(struct connectdata *conn)
+CURLcode Curl_telnet_done(struct connectdata *conn, CURLcode status)
 {
   struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
+  (void)status; /* unused */
+
   curl_slist_free_all(tn->telnet_vars);
 
   free(conn->proto.telnet);