Issue #8914: fix various warnings from the Clang static analyzer v254.
diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index af7ea5b..e137ff6 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -483,6 +483,7 @@
         return PyBytes_FromStringAndSize(NULL, 0);
 
     buf.excobj = NULL;
+    buf.outobj = NULL;
     buf.inbuf = buf.inbuf_top = *data;
     buf.inbuf_end = buf.inbuf_top + datalen;