ftp_readresp: fix build without krb4 support

Oops, my previous commit broke builds with krb support.

lib/ftp.c

@@ -632,8 +632,8 @@ static CURLcode ftp_readresp(curl_socket_t sockfd,
                              size_t *size) /* size of the response */
 {
   struct connectdata *conn = pp->conn;
-#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
   struct SessionHandle *data = conn->data;
+#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
   char * const buf = data->state.buffer;
 #endif
   CURLcode result = CURLE_OK;
@@ -661,7 +661,7 @@ static CURLcode ftp_readresp(curl_socket_t sockfd,
 #endif
 
   /* store the latest code for later retrieval */
-  conn->data->info.httpcode=code;
+  data->info.httpcode=code;
 
   if(ftpcode)
     *ftpcode = code;