Bug#843531: diffoscope: walk through packages twice when comparing two .changes

[Mattia Rizzolo]

package: diffoscope

If you compare two .changes containing .buildinfo in them, diffoscope
will work its way through the binaries twice, through:
    .changes → .deb → file
    .changes → .buildinfo → .deb → file

This leads to:
 * double comparison time
 * differences reported twice in the report (this also means that every
   package will most probably hit the "max report size" limit)
 * annoyance to the user.

-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
more about me:  https://mapreri.org                             : :'  :
Launchpad user: https://launchpad.net/~mapreri                  `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
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