small fix
small fix

Signed-off-by: RJ Catalano <0eb59c29b4a2ba03805b274ee15e75434b5e9157@monax.io>

csrwng/go-dockerclient,csrwng/go-dockerclient,fsouza/go-dockerclient,davidstack/go-dockerclient,davidstack/go-dockerclient