[2.7] bpo-38168: Fix a possbile refleak in setint() of mmapmodule.c (GH-16136) (GH-16176)

(cherry picked from commit 56a45142)

Co-authored-by: Hai Shi shihai1992@gmail.com

https://bugs.python.org/issue38168

Modules/mmapmodule.c

@@ -1436,7 +1436,8 @@ static void
 setint(PyObject *d, const char *name, long value)
 {
     PyObject *o = PyInt_FromLong(value);
-    if (o && PyDict_SetItemString(d, name, o) == 0) {
+    if (o) {
+        PyDict_SetItemString(d, name, o);
         Py_DECREF(o);
     }
 }