Steps to reproduce:
1. program use filechooser with gtk_file_filter_add_pixbuf_formats
2. The directory with the file not to be able to acquire myme_type is opened. 
3. The Application "program" has quit unexpectedly.


Stack trace:

+ Trace 64891

Other information:
gtk_file_filter_filter(gtkfilefilter.c)
FILTER_RULE_PATTERN: check whether filter_info->mime_type is NULL.
but
FILTER_RULE_PIXBUF_FORMATS: no check whether filter_info->mime_type is NULL.

diff -uNr gtk+-2.8.9.org/gtk/gtkfilefilter.c gtk+-2.8.9/gtk/gtkfilefilter.c
--- gtk+-2.8.9.org/gtk/gtkfilefilter.c  2005-03-20 16:01:21.000000000 +0900
+++ gtk+-2.8.9/gtk/gtkfilefilter.c      2006-01-01 21:24:25.000000000 +0900
@@ -425,6 +425,8 @@
          {
            GSList *list;

+           if (filter_info->mime_type == NULL)
+             break;
            for (list = rule->u.pixbuf_formats; list; list = list->next)
              {
                int i;