[3.14] Set default arguments in _testlimitedcapi/unicode.c (GH-159380) (#159412)

Set default arguments in _testlimitedcapi/unicode.c (GH-159380)

Some optional arguments had no default value leading to undefined
behavior if they were omitted.
(cherry picked from commit e96d943)

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: miss-islington

Modules/_testlimitedcapi/unicode.c

@@ -944,7 +944,7 @@ unicode_encodecodepage(PyObject *self, PyObject *args)
 {
     int code_page;
     PyObject *unicode;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "iO|z", &code_page, &unicode, &errors))
         return NULL;
@@ -961,7 +961,7 @@ unicode_decodelocaleandsize(PyObject *self, PyObject *args)
 {
     const char *data;
     Py_ssize_t size;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "y#|z", &data, &size, &errors))
         return NULL;
@@ -975,7 +975,7 @@ unicode_decodelocale(PyObject *self, PyObject *args)
 {
     const char *data;
     Py_ssize_t size;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "y#|z", &data, &size, &errors))
         return NULL;
@@ -988,7 +988,7 @@ static PyObject *
 unicode_encodelocale(PyObject *self, PyObject *args)
 {
     PyObject *unicode;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "O|z", &unicode, &errors))
         return NULL;
@@ -1282,7 +1282,7 @@ unicode_comparewithasciistring(PyObject *self, PyObject *args)
 {
     PyObject *left;
     const char *right = NULL;
-    Py_ssize_t right_len;
+    Py_ssize_t right_len = 0;
     int result;
 
     if (!PyArg_ParseTuple(args, "O|y#", &left, &right, &right_len))
@@ -1321,7 +1321,7 @@ unicode_equaltoutf8andsize(PyObject *self, PyObject *args)
 {
     PyObject *left;
     const char *right = NULL;
-    Py_ssize_t right_len;
+    Py_ssize_t right_len = 0;
     Py_ssize_t size = -100;
     int result;