syncdaemon: fix double wait in monitor

Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2816 ([glusterfs-3.2.0qa14]: gsyncd monitor crashed)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2816

xlators/features/marker/utils/syncdaemon/monitor.py

@@ -41,7 +41,7 @@ class Monitor(object):
             cpid = os.spawnv(os.P_NOWAIT, sys.executable, argv)
             time.sleep(60)
             ret = nwait(cpid, os.WNOHANG)
-            if not ret:
+            if ret == None:
                 self.set_state('OK')
                 ret = nwait(cpid)
             elif ret in (0, 1):