Just as an aside, it's not quite true to say birds have no sense of smell. Some birds do use smell to locate food, kiwis, fulmars and turkey vultures are good examples. Though I'm guessing that not many of us will ever have to deal with turkey vulture chicks in our back garden.
I've never seen anything to suggest that birds use smell to identify or bond with chicks though. I have read that diving petrels, which lay their eggs underground, use smell to identify their burrows.