Put fts_close() where missing.

Not bugs in short-lived commands that call exit() -> _exit() immediately,
but for idempotency.

Originally found in ls(1) by Valgrind.  Changes for other commands are
from deraadt@.  Reviewed by me, tested in snapshots.

OK deraadt@

3 files changed, 6 insertions, 5 deletions

diff --git a/usr.bin/compress/main.c b/usr.bin/compress/main.c
index 4d91398b9a3..e9487918afa 100644
--- a/usr.bin/compress/main.c
+++ b/usr.bin/compress/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.84 2015/05/03 19:44:59 guenther Exp $	*/
+/*	$OpenBSD: main.c,v 1.85 2015/06/25 02:04:08 uebayasi Exp $	*/
 
 /*
  * Copyright (c) 1992, 1993
@@ -463,7 +463,7 @@ main(int argc, char *argv[])
 	}
 	if (list)
 		list_stats(NULL, NULL, NULL);
-
+	fts_close(ftsp);
 	exit(rc);
 }
 
diff --git a/usr.bin/du/du.c b/usr.bin/du/du.c
index ce223066ce2..51f48360e53 100644
--- a/usr.bin/du/du.c
+++ b/usr.bin/du/du.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: du.c,v 1.29 2014/10/20 22:13:11 schwarze Exp $	*/
+/*	$OpenBSD: du.c,v 1.30 2015/06/25 02:04:08 uebayasi Exp $	*/
 /*	$NetBSD: du.c,v 1.11 1996/10/18 07:20:35 thorpej Exp $	*/
 
 /*
@@ -206,6 +206,7 @@ main(int argc, char *argv[])
 	if (cflag) {
 		prtout((quad_t)howmany(totalblocks, blocksize), "total", hflag);
 	}
+	fts_close(fts);
 	exit(rval);
 }
 
diff --git a/usr.bin/grep/util.c b/usr.bin/grep/util.c
index c4b945d4b36..39afe182dd4 100644
--- a/usr.bin/grep/util.c
+++ b/usr.bin/grep/util.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: util.c,v 1.49 2014/12/01 06:36:04 deraadt Exp $	*/
+/*	$OpenBSD: util.c,v 1.50 2015/06/25 02:04:08 uebayasi Exp $	*/
 
 /*-
  * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
@@ -85,7 +85,7 @@ grep_tree(char **argv)
 	}
 	if (errno)
 		err(2, "fts_read");
-
+	fts_close(fts);
 	return c;
 }