util.c: Fix sense of error check in `popitem'.

diff --git a/util.c b/util.c
index 5abd7c9..231e00a 100644 (file)
--- a/util.c
+++ b/util.c
@@ -803,7 +803,7 @@ PyObject *gmapmeth_popitem(PyObject *me, PyObject *arg)
   PyObject *i = 0, *k = 0, *v = 0, *rc = 0;
 
   if (!PyArg_ParseTuple(arg, ":popitem") ||
-      (i = PyObject_GetIter(me)))
+      (i = PyObject_GetIter(me)) == 0)
     goto end;
   if ((k = PyIter_Next(i)) == 0) {
     if (!PyErr_Occurred()) VALERR("popitem(): mapping is empty");