fix possible race during cleanup: avoid None client dereference but k…

…eep claiming that we have handled the message since we must be exiting already to have cleared the reference to the client instance

git-svn-id: https://xpra.org/svn/Xpra/trunk@8804 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/platform/win32/gui.py

@@ -540,11 +540,14 @@ def handle_console_event(self, event):
             log.info("received console event %s", str(event_name).replace("_EVENT", ""))
         else:
             log.warn("unknown console event: %s", event_name)
+        c = self.client
         if event==win32con.CTRL_C_EVENT:
-            self.client.signal_disconnect_and_quit(0, "CTRL_C")
+            if c:
+                c.signal_disconnect_and_quit(0, "CTRL_C")
             return 1
         if event==win32con.CTRL_CLOSE_EVENT:
-            self.client.signal_disconnect_and_quit(0, "CTRL_CLOSE")
+            if c:
+                c.signal_disconnect_and_quit(0, "CTRL_CLOSE")
             return 1
         return 0