core: Remove an unused variable
core: Remove an unused variable

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