key.c: Collect `KeyError' argument count as a separate step.

diff --git a/key.c b/key.c
index dc1b849..4995035 100644 (file)
--- a/key.c
+++ b/key.c
@@ -38,7 +38,9 @@ static PyObject *kxmeth___init__(PyObject *me, PyObject *arg)
 {
   int err;
   PyObject *x = 0;
+  Py_ssize_t n;
 
+  n = PyTuple_GET_SIZE(arg);
   if (!PyArg_ParseTuple(arg, "Oi:__init__", &me, &err) ||
       (x = PyInt_FromLong(err)) == 0 ||
       PyObject_SetAttrString(me, "err", x))
@@ -48,7 +50,7 @@ static PyObject *kxmeth___init__(PyObject *me, PyObject *arg)
       PyObject_SetAttrString(me, "errstring", x))
     goto end;
   Py_DECREF(x); x = 0;
-  if ((x = PyTuple_GetSlice(arg, 1, PyTuple_GET_SIZE(arg))) == 0 ||
+  if ((x = PyTuple_GetSlice(arg, 1, n)) == 0 ||
       PyObject_SetAttrString(me, "args", x))
     goto end;
   Py_DECREF(x); x = 0;