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.

Misc/NEWS

@@ -149,6 +149,9 @@ present).
 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.

Modules/cjkcodecs/multibytecodec.c

@@ -1265,6 +1265,10 @@ static struct PyMethodDef __methods[] = {
 void
 init_multibytecodec(void)
 {
+	MultibyteCodec_Type.ob_type = &PyType_Type;
+	MultibyteStreamReader_Type.ob_type = &PyType_Type;
+	MultibyteStreamWriter_Type.ob_type = &PyType_Type;
+
 	Py_InitModule("_multibytecodec", __methods);
 
 	if (PyErr_Occurred())