Issue #5385: Fixed mmap crash after resize failure on windows.

Now uses NULL instead of INVALID_HANDLE_VALUE as invalid map handle
because CreateFileMapping returns NULL when error occurs.
diff --git a/Misc/NEWS b/Misc/NEWS
index 6e71500..d03ed95 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -168,6 +168,8 @@
 Library
 -------
 
+- Issue #5385: Fixed mmap crash after resize failure on windows.
+
 - Issue #5179: Fixed subprocess handle leak on failure on windows.
 
 - PEP 372:  Added collections.OrderedDict().