fix possible refleaks if PyUnicode_READY fails
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 40c1bd8..e97ce1f 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -2488,8 +2488,12 @@
PyObject *str;
assert(obj);
str = PyObject_Str(obj);
- if (!str || PyUnicode_READY(str) == -1)
+ if (!str)
goto fail;
+ if (PyUnicode_READY(str) == -1) {
+ Py_DECREF(str);
+ goto fail;
+ }
argmaxchar = PyUnicode_MAX_CHAR_VALUE(str);
maxchar = Py_MAX(maxchar, argmaxchar);
n += PyUnicode_GET_LENGTH(str);
@@ -2503,8 +2507,12 @@
PyObject *repr;
assert(obj);
repr = PyObject_Repr(obj);
- if (!repr || PyUnicode_READY(repr) == -1)
+ if (!repr)
goto fail;
+ if (PyUnicode_READY(repr) == -1) {
+ Py_DECREF(repr);
+ goto fail;
+ }
argmaxchar = PyUnicode_MAX_CHAR_VALUE(repr);
maxchar = Py_MAX(maxchar, argmaxchar);
n += PyUnicode_GET_LENGTH(repr);
@@ -2518,8 +2526,12 @@
PyObject *ascii;
assert(obj);
ascii = PyObject_ASCII(obj);
- if (!ascii || PyUnicode_READY(ascii) == -1)
+ if (!ascii)
goto fail;
+ if (PyUnicode_READY(ascii) == -1) {
+ Py_DECREF(ascii);
+ goto fail;
+ }
argmaxchar = PyUnicode_MAX_CHAR_VALUE(ascii);
maxchar = Py_MAX(maxchar, argmaxchar);
n += PyUnicode_GET_LENGTH(ascii);