Plug a leak in timemodule. The module dictionary is saved during

initialization. If the interpreter is shut down and reinitialized (embedded
CPython), the old module dictionary was not dec-refed during the next import of
the time extension module.

Contributed by Torsten Marek of Google.

Modules/timemodule.c

@@ -96,7 +96,7 @@ static int floatsleep(double);
 static double floattime(void);
 
 /* For Y2K check */
-static PyObject *moddict;
+static PyObject *moddict = NULL;
 
 /* Exposed in timefuncs.h. */
 time_t
@@ -858,6 +858,11 @@ inittime(void)
     /* Accept 2-digit dates unless PYTHONY2K is set and non-empty */
     p = Py_GETENV("PYTHONY2K");
     PyModule_AddIntConstant(m, "accept2dyear", (long) (!p || !*p));
+    /* If an embedded interpreter is shutdown and reinitialized the old
+       moddict was not decrefed on shutdown and the next import of this
+       module leads to a leak.  Conditionally decref here to prevent that.
+    */
+    Py_XDECREF(moddict);
     /* Squirrel away the module's dictionary for the y2k check */
     moddict = PyModule_GetDict(m);
     Py_INCREF(moddict);
@@ -1050,5 +1055,3 @@ floatsleep(double secs)
 
     return 0;
 }
-
-