patch for test_autoclose

test_io.rb.patch

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 76eb82c..0fbec35 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1409,13 +1409,15 @@ class TestIO < Test::Unit::TestCase
   end
 
   def try_fdopen(fd, autoclose = true, level = 100)
-    if level > 0
-      try_fdopen(fd, autoclose, level - 1)
-      GC.start
-      level
-    else
-      IO.for_fd(fd, autoclose: autoclose)
-      nil
+    1.times do
+      if level > 0
+        try_fdopen(fd, autoclose, level - 1)
+        GC.start
+        level
+      else
+        IO.for_fd(fd, autoclose: autoclose)
+        nil
+      end
     end
   end