Fixes NULL pointer dereference (CVE-2006-6719) (bz #221483)

--- wget-1.10.2/src/ftp-basic.c.orig	2007-01-04 19:30:31.000000000 +0100
+++ wget-1.10.2/src/ftp-basic.c	2007-01-04 19:31:48.000000000 +0100
@@ -1038,7 +1038,9 @@ ftp_syst (int csock, enum stype *server_
      first word of the server response)?  */
   request = strtok (NULL, " ");
 
-  if (!strcasecmp (request, "VMS"))
+  if (request == NULL)
+    *server_type = ST_OTHER;
+  else if (!strcasecmp (request, "VMS"))
     *server_type = ST_VMS;
   else if (!strcasecmp (request, "UNIX"))
     *server_type = ST_UNIX;