cli/command/container/attach.go:141:15: nilness: impossible condition: nil != nil (govet)
cli/command/container/attach.go:141:15: nilness: impossible condition: nil != nil (govet)

Signed-off-by: Silvin Lubecki <401770a0308861deccc8b11ddc198194637c848d@docker.com>

cpuguy83/cli,docker/cli,cpuguy83/cli,docker/cli,thaJeztah/cli,thaJeztah/cli