gh-142724: Tokenizer should report errors in tuple, not value, when tuple is returned

Value is checked twice by mistake.

Author: AZero13

Misc/NEWS.d/next/Core_and_Builtins/2025-12-14-15-43-02.gh-issue-142724.GtJJL9.rst

@@ -0,0 +1 @@
+Fixed error that would have prevented tuples from being checked.

Parser/pegen_errors.c

@@ -43,7 +43,7 @@ _PyPegen_raise_tokenizer_init_error(PyObject *filename)
 
     tuple = PyTuple_Pack(2, errstr, tmp);
     Py_DECREF(tmp);
-    if (!value) {
+    if (!tuple) {
         goto error;
     }
     PyErr_SetObject(PyExc_SyntaxError, tuple);