Change _PyObject_GC_Resize to expect Py_ssize_t.

Include/objimpl.h

@@ -238,7 +238,7 @@ PyAPI_FUNC(long) PyGC_Collect(void);
 #define PyObject_IS_GC(o) (PyType_IS_GC((o)->ob_type) && \
 	((o)->ob_type->tp_is_gc == NULL || (o)->ob_type->tp_is_gc(o)))
 
-PyAPI_FUNC(PyVarObject *) _PyObject_GC_Resize(PyVarObject *, int);
+PyAPI_FUNC(PyVarObject *) _PyObject_GC_Resize(PyVarObject *, Py_ssize_t);
 #define PyObject_GC_Resize(type, op, n) \
 		( (type *) _PyObject_GC_Resize((PyVarObject *)(op), (n)) )
 

Modules/gcmodule.c

@@ -1284,7 +1284,7 @@ _PyObject_GC_NewVar(PyTypeObject *tp, Py_ssize_t nitems)
 }
 
 PyVarObject *
-_PyObject_GC_Resize(PyVarObject *op, int nitems)
+_PyObject_GC_Resize(PyVarObject *op, Py_ssize_t nitems)
 {
 	const size_t basicsize = _PyObject_VAR_SIZE(op->ob_type, nitems);
 	PyGC_Head *g = AS_GC(op);