libostree: Also use xattr callback for directories
libostree: Also use xattr callback for directories

They need labels too, obviously.

resin-io/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,leandrosansilva/ostree,sujitfulse/ostree,resin-io/ostree,leandrosansilva/ostree,GNOME/ostree,leandrosansilva/ostree,gatispaeglis/ostree,sujitfulse/ostree,resin-io/ostree,leandrosansilva/ostree,gatispaeglis/ostree,GNOME/ostree,sujitfulse/ostree,sujitfulse/ostree,resin-io/ostree,leandrosansilva/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,sujitfulse/ostree,GNOME/ostree,resin-io/ostree