add ensure to restore $stdout correctly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67670 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/reline/key_actor_emacs_test.rb

@@ -1095,6 +1095,7 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
     assert_cursor(6)
     assert_cursor_max(6)
     assert_line('foo_ba')
+  ensure
     $stdout = STDOUT
   end