Don't deref v if it's NULL.

Klocwork #214

Modules/_tkinter.c

@@ -2493,8 +2493,10 @@ Tkapp_CreateTimerHandler(PyObject *self, PyObject *args)
 	}
 
 	v = Tktt_New(func);
+	if (v) {
 		v->token = Tcl_CreateTimerHandler(milliseconds, TimerHandler,
 						  (ClientData)v);
+	}
 
 	return (PyObject *) v;
 }