[gtk+] iconview: Fix a problem with the previous change

[Matthias Clasen <matthiasc src gnome org>]

commit 8916ff8ffeb07ead0575364771e69c5be797f7c4
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jan 31 17:44:26 2018 +0100

    iconview: Fix a problem with the previous change
    
    After commit ffef28a7e8d5ffef7de6a3baccb30b0021b6b0ff,
    gtk-icon-browser was spewing critical warnings when
    changing sections. Avoid that by respecting the return
    value of gtk_tree_model_get_iter.

 gtk/gtkiconview.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkiconview.c b/gtk/gtkiconview.c
index 86be6f8..0a7ed4b 100644
--- a/gtk/gtkiconview.c
+++ b/gtk/gtkiconview.c
@@ -3314,8 +3314,8 @@ gtk_icon_view_row_deleted (GtkTreeModel *model,
   if (gtk_tree_path_get_depth (path) > 1)
     return;
 
-  gtk_tree_model_get_iter (model, &iter, path);
-  gtk_tree_model_unref_node (model, &iter);
+  if (gtk_tree_model_get_iter (model, &iter, path))
+    gtk_tree_model_unref_node (model, &iter);
 
   index = gtk_tree_path_get_indices(path)[0];