[gnome-remote-desktop] session-vnc: Use g_clear_handle_id to clear close_session_idle_id

[Jonas Ådahl <jadahl src gnome org>]

commit d05e7bbbc7ecd9cb075b49722baf7c20449ac621
Author: Pascal Nowack <Pascal Nowack gmx de>
Date:   Fri Jan 1 19:39:56 2021 +0100

    session-vnc: Use g_clear_handle_id to clear close_session_idle_id
    
    As with RDP, it's shorter, more compact and does the same as manually
    checking the id, removing the source if the id is non-zero and setting
    the id to 0.

 src/grd-session-vnc.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
---
diff --git a/src/grd-session-vnc.c b/src/grd-session-vnc.c
index ba3e5ce..74fc765 100644
--- a/src/grd-session-vnc.c
+++ b/src/grd-session-vnc.c
@@ -666,11 +666,7 @@ grd_session_vnc_stop (GrdSession *session)
   g_clear_pointer (&session_vnc->rfb_screen->frameBuffer, g_free);
   g_clear_pointer (&session_vnc->rfb_screen, rfbScreenCleanup);
 
-  if (session_vnc->close_session_idle_id)
-    {
-      g_source_remove (session_vnc->close_session_idle_id);
-      session_vnc->close_session_idle_id = 0;
-    }
+  g_clear_handle_id (&session_vnc->close_session_idle_id, g_source_remove);
 }
 
 static gboolean