Use utime instead of fchmod in WorkerTmp.notify

gunicorn/workers/workertmp.py

@@ -39,11 +39,8 @@ class WorkerTmp(object):
             os.close(fd)
             raise
 
-        self.spinner = 0
-
     def notify(self):
-        self.spinner = (self.spinner + 1) % 2
-        os.fchmod(self._tmp.fileno(), self.spinner)
+        os.utime(self._tmp.fileno())
 
     def last_update(self):
         return os.fstat(self._tmp.fileno()).st_ctime