[ekiga] CallWindow: Fixed GTK warning.

[Damien Sandras <dsandras src gnome org>]

commit d858820909709cbea8c106e9ac2f477414e454af
Author: Damien Sandras <dsandras seconix com>
Date:   Sun Oct 11 16:43:42 2015 +0200

    CallWindow: Fixed GTK warning.
    
    Only try removing source timeouts when there are any.

 lib/engine/gui/gtk-frontend/call-window.cpp |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/lib/engine/gui/gtk-frontend/call-window.cpp b/lib/engine/gui/gtk-frontend/call-window.cpp
index 16d4cf4..bf13be4 100644
--- a/lib/engine/gui/gtk-frontend/call-window.cpp
+++ b/lib/engine/gui/gtk-frontend/call-window.cpp
@@ -763,8 +763,12 @@ on_cleared_call_cb (boost::shared_ptr<Ekiga::Call> call,
 
   if (self->priv->current_call) {
     self->priv->current_call = boost::shared_ptr<Ekiga::Call>();
-    g_source_remove (self->priv->destroy_timeout_id);
-    g_source_remove (self->priv->timeout_id);
+
+    if (self->priv->destroy_timeout_id > 0)
+      g_source_remove (self->priv->destroy_timeout_id);
+    if (self->priv->timeout_id > 0)
+      g_source_remove (self->priv->timeout_id);
+
     self->priv->destroy_timeout_id = 0;
     self->priv->timeout_id = 0;
     self->priv->bad_connection = false;