fix a syntax

xuncl · xuncl · commit 8ca318ffb0ab · 2016-10-14T17:58:37.000+08:00
&#20462;&#22797;&#20043;&#21069;vivre90&#26356;&#26032;&#30340;&#19968;&#28857;&#23567;&#30095;&#24573;
diff --git a/wxbot.py b/wxbot.py
@@ -1140,7 +1140,7 @@ def test_sync_check(self):
                 try:
                     retcode = self.sync_check()[0]
                 except:
-                    retcode == -1
+                    retcode = -1
                 if retcode == '0':
                     return True
         return False
