pkg/bindings: on terminal attach always wait for stdout to be done

Do not exit early just because stdin copy was done.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

pkg/bindings/containers/attach.go

@@ -180,7 +180,7 @@ func Attach(ctx context.Context, nameOrID string, stdin io.Reader, stdout io.Wri
 					return err
 				}
 
-				return nil
+				return <-stdoutChan
 			}
 		}
 	} else {