Correctly restore sys.stdout in test_descr

Lib/test/test_descr.py

@@ -4311,6 +4311,7 @@ order (MRO) for bases """
     def test_file_fault(self):
         # Testing sys.stdout is changed in getattr...
         import sys
+        test_stdout = sys.stdout
         class StdoutGuard:
             def __getattr__(self, attr):
                 sys.stdout = sys.__stdout__
@@ -4320,6 +4321,8 @@ order (MRO) for bases """
             print "Oops!"
         except RuntimeError:
             pass
+        finally:
+            sys.stdout = test_stdout
 
     def test_vicious_descriptor_nonsense(self):
         # Testing vicious_descriptor_nonsense...