totemconfig: Enlarge error_string_response

... so error_reason can be fully included into parse error message.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>

exec/totemconfig.c

@@ -88,7 +88,7 @@
 
 #define DEFAULT_PORT				5405
 
-static char error_string_response[512];
+static char error_string_response[768];
 
 static void add_totem_config_notification(struct totem_config *totem_config);