Make `waiting_fd` behaviour per-IO. (#13127)

- `rb_thread_fd_close` is deprecated and now a no-op.
- IO operations (including close) no longer take a vm-wide lock.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 32d7519bdf..a81d689355 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -3826,7 +3826,7 @@ __END__
       end
 
       tempfiles = []
-      (0..fd_setsize+1).map {|i|
+      (0...fd_setsize).map {|i|
         tempfiles << Tempfile.create("test_io_select_with_many_files")
       }