Fixed geographic admin to be compatible with `ModelAdmin.formfield_for_dbfield` changes in r9760.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9763 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/admin/options.py

@@ -53,6 +53,7 @@ class GeoModelAdmin(ModelAdmin):
         for viewing/editing GeometryFields.
         """
         if isinstance(db_field, models.GeometryField):
+            request = kwargs.pop('request', None)
             # Setting the widget with the newly defined widget.
             kwargs['widget'] = self.get_map_widget(db_field)
             return db_field.formfield(**kwargs)