[poppler] Why do pdfseparate exit with status code 99?

[Patrik Ragnarsson]

As seen here:

> $ mkdir /tmp/pdfs
> $ pdfseparate
> pdfseparate version 0.20.0
> Copyright 2005-2012 The Poppler Developers - http://poppler.freedesktop.org
> Copyright 1996-2011 Glyph & Cog, LLC
> Usage: pdfseparate [options] <PDF-sourcefile> <PDF-pattern-destfile>
>   -f <int>       : first page to extract
>   -l <int>       : last page to extract
>   -v             : print copyright and version info
>   -h             : print usage information
>   -help          : print usage information
>   --help         : print usage information
>   -?             : print usage information
> $ pdfseparate document.pdf /tmp/pdfs/%d.pdf
> $ echo $?
> 99
> $ ls /tmp/pdfs
> 1.pdf   12.pdf  15.pdf  18.pdf  20.pdf  23.pdf  26.pdf  29.pdf  31.pdf  34.pdf  37.pdf  5.pdf   8.pdf
> 10.pdf  13.pdf  16.pdf  19.pdf  21.pdf  24.pdf  27.pdf  3.pdf   32.pdf  35.pdf  38.pdf  6.pdf   9.pdf
> 11.pdf  14.pdf  17.pdf  2.pdf   22.pdf  25.pdf  28.pdf  30.pdf  33.pdf  36.pdf  4.pdf   7.pdf