[Bug 1850184] Re: losetup -f broken in 2.0.6-1ubuntu2

[Dimitri John Ledkov]

device = find_unused_loop_device();
if (device == NULL)
	return -1;
if (verbose)
	printf("Loop device is %s\n", device);
if (argc == optind) {
	printf("%s\n", device);
	return 0;
}
file = argv[optind];

Somehow... argc == optind condition is false, and instead of exiting the
program, we go into "show" mode on the just detected loop device, which
fails, as it is a free one and there is nothing to show.

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Title:
  losetup -f broken in 2.0.6-1ubuntu2

Status in klibc package in Ubuntu:
  New

Bug description:
  http://autopkgtest.ubuntu.com/packages/c/casper/focal/amd64

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-focal/focal/amd64/c/casper/20191025_214555_df8b8@/log.gz

  ...
  [   11.751912] EXT4-fs (sda1): mounting ext2 file system using the ext4 subsystem
  [   11.761441] EXT4-fs (sda1): mounted filesystem without journal. Opts: (null)
  loop: can't get info on device /dev/loop1: No such device or address

  
  BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu4) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs) + mkdir result
  + set -x
  + read LINE
  + grep -e '^--OUT .* BEGIN-- .* --END--$' qemu-output.txt
  ++ grep -q /rofs result/lsblk.txt
  grep: result/lsblk.txt: No such file or directory
  autopkgtest [21:45:45]: test boot: -----------------------]
  autopkgtest [21:45:45]: test boot:  - - - - - - - - - - results - - - - - - - - - -
  boot                 FAIL non-zero exit status 2
  autopkgtest [21:45:45]: @@@@@@@@@@@@@@@@@@@@ summary
  boot                 FAIL non-zero exit status 2
  ...

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