[gtk+] gtktreeviewaccessible: Fix a potential division by zero

[Philip Withnall <pwithnall src gnome org>]

commit ada766025f1dc32e494e83b806ad625d0756ab1d
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Wed Nov 20 17:25:48 2013 +0000

    gtktreeviewaccessible: Fix a potential division by zero
    
    Found with scan-build.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=712760

 gtk/a11y/gtktreeviewaccessible.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/a11y/gtktreeviewaccessible.c b/gtk/a11y/gtktreeviewaccessible.c
index fb9e2ce..21e86b3 100644
--- a/gtk/a11y/gtktreeviewaccessible.c
+++ b/gtk/a11y/gtktreeviewaccessible.c
@@ -954,7 +954,7 @@ gtk_tree_view_accessible_ref_selection (AtkSelection *selection,
   table = ATK_TABLE (selection);
   n_columns = gtk_tree_view_accessible_get_n_columns (table);
   n_selected = gtk_tree_view_accessible_get_selected_rows (table, &selected);
-  if (i >= n_columns * n_selected)
+  if (n_columns == 0 || i >= n_columns * n_selected)
     return NULL;
 
   row = selected[i / n_columns];