[scripts] Fix bug in retry.pl. (#2453)

Author: danpovey

egs/wsj/s5/utils/parallel/retry.pl

@@ -96,4 +96,4 @@ sub get_log_file {
 }
 
 print STDERR "$0: job failed $num_tries times; log is in $log_file\n";
-exit($return_status);
+exit(1);