Exception Chaining missing method for suppressing context

Objects/exceptions.c

 /*
  * New exceptions.c written in Iceland by Richard Jones and Georg Brandl.
  *
  * Thanks go to Tim Peters and Michael Hudson for debugging.
  */
 
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "structmember.h"
 #include "osdefs.h"
@@ skipping 2463 matching lines @@
             args_tuple = PyTuple_Pack(1, exc_message);
             if (!args_tuple)
                 Py_FatalError("cannot allocate tuple for RuntimeError "
                                 "pre-allocation");
             Py_DECREF(exc_message);
             if (BaseException_init(err_inst, args_tuple, NULL))
                 Py_FatalError("init of pre-allocated RuntimeError failed");
             Py_DECREF(args_tuple);
         }
     }
-
+    Py_DECREF(bltinmod);
 }
 
 void
 _PyExc_Fini(void)
 {
     Py_CLEAR(PyExc_RecursionErrorInst);
     free_preallocated_memerrors();
     Py_CLEAR(errnomap);
 }