SF Patch #1297028, cjkcodecs does not initialize type pointer

Fix segfault.  I tried to write a test, but it wouldn't crash
when running regrtest.  This really should have some sort of test.

Should definitely be backported.
diff --git a/Misc/NEWS b/Misc/NEWS
index 293ba2f..9144f5d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -149,6 +149,9 @@
 Extension Modules
 -----------------
 
+- Patch #1297028: fix segfault if call type on MultibyteCodec,
+  MultibyteStreamReader, or MultibyteStreamWriter
+
 - Fix memory leak in posix.access().
 
 - Patch #1213831: Fix typo in unicodedata._getcode.