[3.14] pythongh-133590: ensure that TableEntry.linenumber_borrow is initialized (pythonGH-133681) (python#133872)

pythongh-133590: ensure that `TableEntry.linenumber_borrow` is initialized (pythonGH-133681)
(cherry picked from commit c838e21)

Co-authored-by: Lauta <ljfp@ljfp.xyz>

Author: miss-islington

Python/stackrefs.c

@@ -1,4 +1,3 @@
-
 #include "Python.h"
 
 #include "pycore_object.h"
@@ -34,6 +33,7 @@ make_table_entry(PyObject *obj, const char *filename, int linenumber)
     result->filename = filename;
     result->linenumber = linenumber;
     result->filename_borrow = NULL;
+    result->linenumber_borrow = 0;
     return result;
 }