Add a regression test for r327794.

MFC after:	2 weeks

cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/env/tst.setenv3.ksh

@@ -0,0 +1,34 @@
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2012 by Delphix. All rights reserved.
+#
+
+#
+# Reset an environment variable we already know to be set.
+# Regression test for FreeBSD r327794.
+#
+
+if [ $# != 1 ]; then
+	echo expected one argument: '<'dtrace-path'>'
+	exit 2
+fi
+
+dtrace=$1
+
+$dtrace -q -Z -n doogle -xsetenv=PATH=/foo -c '/usr/bin/printenv PATH'
+
+exit $?

cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/env/tst.setenv3.ksh.out

@@ -0,0 +1,2 @@
+/foo
+

cddl/usr.sbin/dtrace/tests/common/env/Makefile

@@ -15,6 +15,8 @@ ${PACKAGE}FILES= \
      tst.setenv1.ksh.out  \
      tst.setenv2.ksh  \
      tst.setenv2.ksh.out  \
+     tst.setenv3.ksh  \
+     tst.setenv3.ksh.out  \
      tst.unsetenv1.ksh  \
      tst.unsetenv1.ksh.out  \
      tst.unsetenv2.ksh  \