xz decompression in pkg/machine bugs

[mtrmac]

• Errors are silently discarded in

  podman/pkg/machine/compression/decompress.go

  Line 140 in f756e5d

  logrus.Error(err)

  : Refactor machine decompress.go #21592 (comment)

• podman/pkg/machine/compression/decompress.go

  Line 151 in f756e5d

  p.Wait()

  can return before all data is copied: Refactor machine decompress.go #21592 (comment) (And it’s unclear to me why there is a goroutine involved at all, cmd.Start() is ~non-blocking.)