fix duplicate func in test

Author: tom-pytel

Lib/test/test_free_threading/test_io.py

@@ -28,10 +28,6 @@ def check(self, funcs, *args):
     def test_free_threading(self):
         """Test for segfaults and aborts."""
 
-        def read(barrier, b, *ignore):
-            barrier.wait()
-            b.read()
-
         def write(barrier, b, *ignore):
             barrier.wait()
             try: b.write(b'0' * randint(100, 1000))