[gnome-software] Don't emit a critical warning if there are no AppStream icons

[Richard Hughes <rhughes src gnome org>]

commit 559ad86f025eecabb0e2c14c22e613691b51bf3a
Author: Richard Hughes <richard hughsie com>
Date:   Wed Oct 16 11:45:01 2013 +0100

    Don't emit a critical warning if there are no AppStream icons

 src/plugins/gs-plugin-appstream.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/src/plugins/gs-plugin-appstream.c b/src/plugins/gs-plugin-appstream.c
index 429495f..24d83e4 100644
--- a/src/plugins/gs-plugin-appstream.c
+++ b/src/plugins/gs-plugin-appstream.c
@@ -53,14 +53,18 @@ gs_plugin_appstream_icons_are_new_layout (const gchar *dirname)
 {
        GDir *dir;
        const gchar *tmp;
-       gboolean ret;
+       gboolean ret = TRUE;
 
        /* simply test if the first item is a file and if not, the icons are
         * in the new /var/cache/app-info/icons/${repo}/gimp.png layout */
        dir = g_dir_open (dirname, 0, NULL);
+       if (dir == NULL)
+               goto out;
        tmp = g_dir_read_name (dir);
        ret = g_strstr_len (tmp, -1, ".") == NULL;
-       g_dir_close (dir);
+out:
+       if (dir != NULL)
+               g_dir_close (dir);
        return ret;
 }