Qt4: Fixed uninitialized variable

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit c023657699e30dbdb6681d5364e73c3114f7e27e)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/dialogs/bookmarks.cpp

@@ -109,7 +109,7 @@ void BookmarksDialog::update()
     if( !p_input ) return;
 
     seekpoint_t **pp_bookmarks;
-    int i_bookmarks;
+    int i_bookmarks = 0;
 
     if( bookmarksList->topLevelItemCount() > 0 )
     {