Silence expression result unused warnings with clang.
The PyObject_INIT() macros returns obj:

../cpython/Objects/methodobject.c:32:23: warning: expression result unused [-Wunused-value]
        PyObject_INIT(op, &PyCFunction_Type);
                      ^~
../cpython/Include/objimpl.h:139:69: note: expanded from macro 'PyObject_INIT'
    ( Py_TYPE(op) = (typeobj), _Py_NewReference((PyObject *)(op)), (op) )
                                                                    ^
1 warning generated.
diff --git a/Objects/longobject.c b/Objects/longobject.c
index a5c0d1b..68a667e 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -5089,7 +5089,7 @@
             assert(v->ob_digit[0] == abs(ival));
         }
         else {
-            PyObject_INIT(v, &PyLong_Type);
+            (void)PyObject_INIT(v, &PyLong_Type);
         }
         Py_SIZE(v) = size;
         v->ob_digit[0] = abs(ival);