Do not leak when calling hif_state_set_cancellable() more than once
Do not leak when calling hif_state_set_cancellable() more than once

Conan-Kudo/libhif,rpm-software-management/libdnf,hughsie/libhif,hughsie/libhif,rpm-software-management/libdnf,cgwalters/libhif,Conan-Kudo/libhif,edynox/libdnf,kalev/libhif,edynox/libdnf,rpm-software-management/libhif,rpm-software-management/libdnf,Conan-Kudo/libhif,rpm-software-management/libhif,hughsie/libhif,edynox/libdnf,kalev/libhif,edynox/libdnf,Conan-Kudo/libhif,cgwalters/libhif,cgwalters/libhif,cgwalters/libhif,hughsie/libhif,rpm-software-management/libhif,rpm-software-management/libdnf,juhp/libhif,rpm-software-management/libhif,juhp/libhif