gabble_search_manager_close_all: free the requests_waiting_disco list if needed
gabble_search_manager_close_all: free the requests_waiting_disco list if needed

jku/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble