Use PyObject_* allocator since FutureFeatures is small

Python/compile.c

@@ -314,7 +314,7 @@ compiler_free(struct compiler *c)
 	if (c->c_st)
 		PySymtable_Free(c->c_st);
 	if (c->c_future)
-		PyMem_Free(c->c_future);
+		PyObject_Free(c->c_future);
 	Py_DECREF(c->c_stack);
 }
 

Python/future.c

@@ -120,14 +120,14 @@ PyFuture_FromAST(mod_ty mod, const char *filename)
 {
 	PyFutureFeatures *ff;
 
-	ff = (PyFutureFeatures *)PyMem_Malloc(sizeof(PyFutureFeatures));
+	ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
 	if (ff == NULL)
 		return NULL;
 	ff->ff_features = 0;
 	ff->ff_lineno = -1;
 
 	if (!future_parse(ff, mod, filename)) {
-		PyMem_Free((void *)ff);
+		PyObject_Free(ff);
 		return NULL;
 	}
 	return ff;