[Debian-med-packaging] Bug#918390: zstd: zstdgrep has return code 1 on normal exit

[Jörg-Volker Peetz]

Package: zstd
Version: 1.3.8+dfsg-2
Severity: normal

Dear Maintainer(s),

the search command zstdgrep always returns an exit code of 1 when
called with file name(s).
The logic with EXIT_CODE and CUR_EXIT_CODE in that shell script seems
bogus to me. Shouldn't something simple like

EXIT_CODE=0
...
    [ "$?" -ne 0 ] && EXIT_CODE=1
...

work?
I attach a patch which also corrects a minor nit regarding the *egrep and *fgrep
variants.

Regards,
Jörg.
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