Fix #7843

When doing `docker start -a` on a container that won't start, terminal
was getting stuck on the attach, even after container removal.

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)

api/client/commands.go

@@ -664,7 +664,6 @@ func (cli *DockerCli) CmdStart(args ...string) error {
 	if encounteredError != nil {
 		if *openStdin || *attach {
 			cli.in.Close()
-			<-cErr
 		}
 		return encounteredError
 	}