Merge ssize_t branch.
diff --git a/Python/mactoolboxglue.c b/Python/mactoolboxglue.c
index 406b002..7f0627e 100644
--- a/Python/mactoolboxglue.c
+++ b/Python/mactoolboxglue.c
@@ -363,10 +363,10 @@
 \
 int routinename(PyObject *pyobj, object *cobj) { \
     if (!PyMacGluePtr_##routinename) { \
-       if (!PyImport_ImportModule(module)) return NULL; \
+       if (!PyImport_ImportModule(module)) return 0; \
        if (!PyMacGluePtr_##routinename) { \
            PyErr_SetString(PyExc_ImportError, "Module did not provide routine: " module ": " #routinename); \
-           return NULL; \
+           return 0; \
        } \
     } \
     return (*PyMacGluePtr_##routinename)(pyobj, cobj); \