* fixed 2 segfaults when switching categories within the preferences. The...

* fixed 2 segfaults when switching categories within the preferences. The options for CONFIG_SUBCATEGORY and CONFIG_CATEGORY aren't displayed, yet.

modules/gui/macosx/prefs.m

@@ -632,7 +632,7 @@ static VLCTreeItem *o_root_item = nil;
             do
             {
                 p_item++;
-                if( !p_item )
+                if( !p_item || !p_item->i_type )
                 {
                     msg_Err( p_intf, "invalid preference item found" );
                     break;

modules/gui/macosx/prefs_widgets.m

@@ -392,7 +392,7 @@
     if( self != nil )
     {
         p_item = _p_item;
-        psz_name = strdup( p_item->psz_name );
+        psz_name = p_item->psz_name;
         o_label = NULL;
         i_type = p_item->i_type;
         i_view_type = 0;