rem: scheduled_transaction_buf = NULL;
add: scheduled_transaction_buf = 0;
context: GtkTreeIter *cherche_iter_echeance ( struct operation_echeance *echeance ){    struct operation_echeance *scheduled_transaction_buf;    GtkTreeIter iter;    GtkTreeModel *model;    if ( !echeance )	return NULL;    model = GTK_TREE_MODEL ( gtk_tree_view_get_model ( GTK_TREE_VIEW ( tree_view_liste_echeances )));    /*     on va faire le tour de la liste, et dès qu'une opé = echeance */    /* 	on retourne son iter */    gtk_tree_model_get_iter_first ( model,				    &iter );    scheduled_transaction_buf = NULL;    do    {	gtk_tree_model_get ( model,			     &iter,			     11, &scheduled_transaction_buf,			     -1 );    }    while ( scheduled_transaction_buf != echeance	    &&	    gtk_tree_model_iter_next ( model,				       &iter ));    if ( scheduled_transaction_buf == echeance )	return ( gtk_tree_iter_copy ( &iter ));    else	return NULL;}