Use the correct object for fetching.

www/swreg/callhome.php

@@ -67,7 +67,7 @@ try {
     exit(1);
 }
 
-$row = $res->fetch();
+$row = $sth->fetch();
 $sth->closeCursor();
 
 if ($row['should_re_ztp'] == 1) {