gh-115567: Catch test_ctypes.test_callbacks.test_i38748_stackCorrupti…

…on stdout output (GH-115568)

Lib/test/test_ctypes/test_callbacks.py

@@ -148,9 +148,10 @@ def callback(a, b):
             print(f"a={a}, b={b}, c={c}")
             return c
         dll = cdll[_ctypes_test.__file__]
-        # With no fix for i38748, the next line will raise OSError and cause the test to fail.
-        self.assertEqual(dll._test_i38748_runCallback(callback, 5, 10), 15)
-
+        with support.captured_stdout() as out:
+            # With no fix for i38748, the next line will raise OSError and cause the test to fail.
+            self.assertEqual(dll._test_i38748_runCallback(callback, 5, 10), 15)
+            self.assertEqual(out.getvalue(), "a=5, b=10, c=15\n")
 
 if hasattr(ctypes, 'WINFUNCTYPE'):
     class StdcallCallbacks(Callbacks):