[gnome-commander/gcmd-1-2-8] Fix for 'g_source_remove: assertion "tag > 0" failed' assertion

[Piotr Eljasiak <epiotr src gnome org>]

commit 8d3c2810c99accb51dccaf3f640a64ce89ebeabc
Author: Martin Riarte <martinriarte opticare com ar>
Date:   Fri Aug 6 23:18:43 2010 +0200

    Fix for 'g_source_remove: assertion "tag > 0" failed' assertion

 src/gnome-cmd-file-props-dialog.cc |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/gnome-cmd-file-props-dialog.cc b/src/gnome-cmd-file-props-dialog.cc
index 0b2a707..ebb6238 100644
--- a/src/gnome-cmd-file-props-dialog.cc
+++ b/src/gnome-cmd-file-props-dialog.cc
@@ -141,8 +141,9 @@ static void calc_tree_size_func (GnomeCmdFilePropsDialogPrivate *data)
 // Tells the thread to exit and then waits for it to do so.
 static gboolean join_thread_func (GnomeCmdFilePropsDialogPrivate *data)
 {
-    g_source_remove (data->updater_proc_id);
-    
+    if (data->updater_proc_id)
+        g_source_remove (data->updater_proc_id);
+
     if (data->thread)
         g_thread_join (data->thread);