upgrade: Properly set origin_refspec variable for resolve/printing
upgrade: Properly set origin_refspec variable for resolve/printing

1) We were ignoring the remote, which is broken
2) We were printing NULL later on

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