fmt_info_messages: don't include ttyname if it is NULL

The NULL check was commented out for testing but should have been
restored.  Fixes a potential protocol error message from sudo_logsrvd.

--HG--
branch : 1.9

Author: millert

plugins/sudoers/log_client.c

@@ -917,9 +917,9 @@ fmt_info_messages(struct client_closure *closure, struct eventlog *evlog,
     fill_str("submithost", evlog->submithost);
     /* TODO - submituid */
     fill_str("submituser", evlog->submituser);
-//    if (evlog->ttyname != NULL) {
+    if (evlog->ttyname != NULL) {
 	fill_str("ttyname", evlog->ttyname);
- //   }
+    }
 
     /* Free unused structs. */
     while (info_msgs_size > n)