[gnome-software] Fix compile warning in the new folder code

[Richard Hughes <rhughes src gnome org>]

commit 35bbb129883d9802fab778453fbd25bab9e4bf74
Author: Richard Hughes <richard hughsie com>
Date:   Thu Jan 23 09:50:41 2014 +0000

    Fix compile warning in the new folder code

 src/gs-folders.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/gs-folders.c b/src/gs-folders.c
index b7f7a61..a76c3b3 100644
--- a/src/gs-folders.c
+++ b/src/gs-folders.c
@@ -396,12 +396,13 @@ gs_folders_remove_folder (GsFolders *folders, const gchar *id)
 
        g_hash_table_iter_init (&iter, folders->priv->categories);
        while (g_hash_table_iter_next (&iter, NULL, (gpointer*)folder)) {
-               if (g_strcmp0 (id, folder->id) == 0) {
+               if (folder && g_strcmp0 (id, folder->id) == 0) {
                        g_hash_table_iter_remove (&iter);
                }
        }
 
-       g_hash_table_remove (folders->priv->folders, folder->id);
+       if (folder != NULL)
+               g_hash_table_remove (folders->priv->folders, folder->id);
 }
 
 const gchar *