gh-99537: Use Py_SETREF(var, NULL) in C code (#99687)

Replace "Py_DECREF(var); var = NULL;" with "Py_SETREF(var, NULL);".

1 files changed, 4 insertions, 8 deletions

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index c2cf79a727f..b3b7e8d6c50 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -218,8 +218,7 @@ builtin___build_class__(PyObject *self, PyObject *const *args, Py_ssize_t nargs,
                         "__class__ set to %.200R defining %.200R as %.200R";
                     PyErr_Format(PyExc_TypeError, msg, cell_cls, name, cls);
                 }
-                Py_DECREF(cls);
-                cls = NULL;
+                Py_SETREF(cls, NULL);
                 goto error;
             }
         }
@@ -2483,8 +2482,7 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
         long i_result = PyLong_AsLongAndOverflow(result, &overflow);
         /* If this already overflowed, don't even enter the loop. */
         if (overflow == 0) {
-            Py_DECREF(result);
-            result = NULL;
+            Py_SETREF(result, NULL);
         }
         while(result == NULL) {
             item = PyIter_Next(iter);
@@ -2534,8 +2532,7 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
 
     if (PyFloat_CheckExact(result)) {
         double f_result = PyFloat_AS_DOUBLE(result);
-        Py_DECREF(result);
-        result = NULL;
+        Py_SETREF(result, NULL);
         while(result == NULL) {
             item = PyIter_Next(iter);
             if (item == NULL) {
@@ -2582,8 +2579,7 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
         if (item == NULL) {
             /* error, or end-of-sequence */
             if (PyErr_Occurred()) {
-                Py_DECREF(result);
-                result = NULL;
+                Py_SETREF(result, NULL);
             }
             break;
         }