Merge "fs_mgr: dmctl: fix 'dmctl help' output"

using DmBlockDevice = ::android::dm::DeviceMapper::DmBlockDevice;

static int Usage(void) {

    std::cerr << "usage: dmctl <command> [command options]";

    std::cerr << "commands:";

    std::cerr << "  create <dm-name> [dm-target> [-lo <filename>] <dm-target-args>]";

    std::cerr, "  delete <dm-name>";

    std::cerr, "  list <devices | targets>";

    std::cerr, "  help";

    std::cerr << "usage: dmctl <command> [command options]" << std::endl;

    std::cerr << "commands:" << std::endl;

    std::cerr << "  create <dm-name> [<dm-target> [-lo <filename>] <dm-target-args>]" << std::endl;

    std::cerr << "  delete <dm-name>" << std::endl;

    std::cerr << "  list <devices | targets>" << std::endl;

    std::cerr << "  help" << std::endl;

    return -EINVAL;

}