[gtk+] listbox: fix a segfault

[Cosimo Cecchi <cosimoc src gnome org>]

commit 24fd96d83784e862c1c7e8eb18bae03bfddd2fab
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu May 1 19:46:47 2014 +0200

    listbox: fix a segfault
    
    Don't dereference a NULL pointer.

 gtk/gtklistbox.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtklistbox.c b/gtk/gtklistbox.c
index 6fb9e25..b6d0fe2 100644
--- a/gtk/gtklistbox.c
+++ b/gtk/gtklistbox.c
@@ -2281,8 +2281,8 @@ gtk_list_box_get_preferred_height (GtkWidget *widget,
                                    gint      *minimum_height,
                                    gint      *natural_height)
 {
-  gint natural_width;
-  gtk_list_box_get_preferred_width (widget, NULL, &natural_width);
+  gint min_width, natural_width;
+  gtk_list_box_get_preferred_width (widget, &min_width, &natural_width);
   gtk_list_box_get_preferred_height_for_width (widget, natural_width,
                                                minimum_height, natural_height);
 }
@@ -2971,9 +2971,9 @@ gtk_list_box_row_get_preferred_height (GtkWidget *widget,
                                        gint      *minimum_height,
                                        gint      *natural_height)
 {
-  gint natural_width;
+  gint min_width, natural_width;
 
-  gtk_list_box_row_get_preferred_width (widget, NULL, &natural_width);
+  gtk_list_box_row_get_preferred_width (widget, &min_width, &natural_width);
   gtk_list_box_row_get_preferred_height_for_width (widget, natural_width,
                                                    minimum_height, natural_height);
 }