hush: fix multiple redirections of the same fd (bug 227)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-misc/redir6.right b/shell/hush_test/hush-misc/redir6.right
new file mode 100644
index 0000000..a97c4bd
--- /dev/null
+++ b/shell/hush_test/hush-misc/redir6.right
@@ -0,0 +1,4 @@
+Testing multiple redirections to same fd
+Hello
+Done1
+Done2