Fix reference leaks introduced by the recent incremental codec
changes.
diff --git a/Modules/cjkcodecs/multibytecodec.h b/Modules/cjkcodecs/multibytecodec.h
index 671ecae..22ea5d4 100644
--- a/Modules/cjkcodecs/multibytecodec.h
+++ b/Modules/cjkcodecs/multibytecodec.h
@@ -123,10 +123,10 @@
#define ERROR_IGNORE (PyObject *)(2)
#define ERROR_REPLACE (PyObject *)(3)
#define ERROR_ISCUSTOM(p) ((p) < ERROR_STRICT || ERROR_REPLACE < (p))
-#define ERROR_DECREF(p) do { \
- if (ERROR_ISCUSTOM(p)) { \
- Py_DECREF(p); \
- } \
+#define ERROR_DECREF(p) do { \
+ if (p != NULL && ERROR_ISCUSTOM(p)) { \
+ Py_DECREF(p); \
+ } \
} while (0);
#define MBENC_FLUSH 0x0001 /* encode all characters encodable */