Issue #8914: fix various warnings from the Clang static analyzer v254.
diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index 6195940..cd44471 100644
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -1461,7 +1461,7 @@
         goto Done;
     Py_DECREF(x1);
     Py_DECREF(x2);
-    x1 = x2 = NULL;
+    /* x1 = */ x2 = NULL;
 
     /* x3 has days+seconds in seconds */
     x1 = PyNumber_Multiply(x3, us_per_second);          /* us */