[gtk+] Fix some refcounting issues in the print dialog

[Matthias Clasen <matthiasc src gnome org>]

commit 315bb30220a6df0d61bb1959aab7cd5fa9a67217
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Apr 1 22:02:38 2011 -0400

    Fix some refcounting issues in the print dialog
    
    gtk_tree_model_get returns a reference for objects, but the
    printers in the model can be NULL,
    https://bugzilla.gnome.org/show_bug.cgi?id=646446

 gtk/gtkprintunixdialog.c |   22 ++++++++++------------
 1 files changed, 10 insertions(+), 12 deletions(-)
---
diff --git a/gtk/gtkprintunixdialog.c b/gtk/gtkprintunixdialog.c
index d555c1b..0a7e6ac 100644
--- a/gtk/gtkprintunixdialog.c
+++ b/gtk/gtkprintunixdialog.c
@@ -774,13 +774,11 @@ void set_cell_sensitivity_func (GtkTreeViewColumn *tree_column,
   gtk_tree_model_get (tree_model, iter, PRINTER_LIST_COL_PRINTER_OBJ, &printer, -1);
 
   if (printer != NULL && !gtk_printer_is_accepting_jobs (printer))
-    g_object_set (cell,
-                  "sensitive", FALSE,
-                  NULL);
+    g_object_set (cell, "sensitive", FALSE, NULL);
   else
-    g_object_set (cell,
-                  "sensitive", TRUE,
-                  NULL);
+    g_object_set (cell, "sensitive", TRUE, NULL);
+
+  g_object_unref (printer);
 }
 
 static void
@@ -1009,10 +1007,8 @@ is_printer_active (GtkTreeModel       *model,
   GtkPrinter *printer;
   GtkPrintUnixDialogPrivate *priv = dialog->priv;
 
-  gtk_tree_model_get (model,
-                      iter,
-                      PRINTER_LIST_COL_PRINTER_OBJ,
-                      &printer,
+  gtk_tree_model_get (model, iter,
+                      PRINTER_LIST_COL_PRINTER_OBJ, &printer,
                       -1);
 
   if (printer == NULL)
@@ -1082,8 +1078,10 @@ default_printer_list_sort_func (GtkTreeModel *model,
 
   g_free (a_name);
   g_free (b_name);
-  g_object_unref (a_printer);
-  g_object_unref (b_printer);
+  if (a_printer)
+    g_object_unref (a_printer);
+  if (b_printer)
+    g_object_unref (b_printer);
 
   return result;
 }