[xml/sgml-pkgs] Bug#727075: libxml2-utils: xmllint doesn't always terminate with a non-zero exit status in case of bad usage

[Vincent Lefevre]

Control: retitle -1 libxml2-utils: xmllint doesn't always terminate with a non-zero exit status in case of error (bad usage, etc.)

This has recently been mentioned in the XML list:

  https://mail.gnome.org/archives/xml/2021-June/msg00000.html
  https://mail.gnome.org/archives/xml/2021-June/msg00001.html

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