test_both(): I believe this was a typo: m is only defined if no

exception occurred so it should only be closed in the else clause.
Without this change we can an UnboundLocalError on Linux:

Traceback (most recent call last):
  File "Lib/test/test_mmap.py", line 304, in ?
    test_both()
  File "Lib/test/test_mmap.py", line 208, in test_both
    m.close()
UnboundLocalError: local variable 'm' referenced before assignment

Lib/test/test_mmap.py

@@ -205,7 +205,7 @@ def test_both():
             # we expect a ValueError on Unix, but not on Windows
             if not sys.platform.startswith('win'):
                 verify(0, "Opening mmap with size+1 should raise ValueError.")
-        m.close()
+            m.close()
         f.close()
         if sys.platform.startswith('win'):
             # Repair damage from the resizing test.