[gtk+] icon-theme: Add some preconditions for NULL arguments

[Stefan Walter <stefw src gnome org>]

commit c8de9abe98d64295223860d2eb68090a788c73f6
Author: Stef Walter <stefw gnome org>
Date:   Fri Nov 9 11:55:44 2012 +0100

    icon-theme: Add some preconditions for NULL arguments
    
    Related to this crash: https://bugzilla.gnome.org/show_bug.cgi?id=687967
    
    https://bugzilla.gnome.org/show_bug.cgi?id=687977

 gtk/gtkicontheme.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index 764320b..90806ee 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -3318,6 +3318,7 @@ gtk_icon_info_load_symbolic (GtkIconInfo    *icon_info,
   gchar *icon_uri;
   gboolean is_symbolic;
 
+  g_return_val_if_fail (icon_info != NULL, NULL);
   g_return_val_if_fail (fg != NULL, NULL);
 
   icon_uri = NULL;
@@ -3398,6 +3399,9 @@ gtk_icon_info_load_symbolic_for_context (GtkIconInfo      *icon_info,
   gchar *icon_uri;
   gboolean is_symbolic;
 
+  g_return_val_if_fail (icon_info != NULL, NULL);
+  g_return_val_if_fail (context != NULL, NULL);
+
   icon_uri = NULL;
   if (icon_info->icon_file)
     icon_uri = g_file_get_uri (icon_info->icon_file);
@@ -3485,6 +3489,9 @@ gtk_icon_info_load_symbolic_for_style (GtkIconInfo   *icon_info,
   gchar *icon_uri;
   gboolean is_symbolic;
 
+  g_return_val_if_fail (icon_info != NULL, NULL);
+  g_return_val_if_fail (style != NULL, NULL);
+
   icon_uri = NULL;
   if (icon_info->icon_file)
     icon_uri = g_file_get_uri (icon_info->icon_file);