gabble_connection_set_contact_info: avoid unnecessary dup/free of struct contents
gabble_connection_set_contact_info: avoid unnecessary dup/free of struct contents

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