hush: fix a case when redirect to a closed fd #1 is not restoring (closing) it

function                                             old     new   delta
setup_redirects                                      200     245     +45
append_squirrel                                        -      41     +41
save_fds_on_redirect                                 256     221     -35
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 86/-35)             Total: 51 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/shell/hush_test/hush-redir/redir.right b/shell/hush_test/hush-redir/redir.right
new file mode 100644
index 000000000..4de5ec701
--- /dev/null
+++ b/shell/hush_test/hush-redir/redir.right
@@ -0,0 +1,2 @@
+hush: write error: Bad file descriptor
+TEST
diff --git a/shell/hush_test/hush-redir/redir.tests b/shell/hush_test/hush-redir/redir.tests
new file mode 100755
index 000000000..7a1a66806
--- /dev/null
+++ b/shell/hush_test/hush-redir/redir.tests
@@ -0,0 +1,6 @@
+# test: closed fds should stay closed
+exec 1>&-
+echo TEST >TEST
+echo JUNK # lost: stdout is closed
+cat TEST >&2
+rm TEST