McdDispatchOperation: make it clearer that unique_name is not leaked
McdDispatchOperation: make it clearer that unique_name is not leaked

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control