[Bug 265461] skein* command returns 0 exit code with '-q' and with incorrect skein string

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265461

            Bug ID: 265461
           Summary: skein* command returns 0 exit code with '-q' and with
                    incorrect skein string
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: dmitrij@gusev.co

Hello.
skein* -q -c <skein hash string> <file>
returns 0 even if the hash doesn't match file.
without '-q' same command returns 2 on exit if the hash doesn't match file.

Example:
$ date > test.txt
$ skein256sum test.txt > test.txt.skein256
$ cat test.txt.skein256
73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119446e24  test.txt
$ skein256 -c 73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119446e24
test.txt; echo $?
Skein256 (test.txt) =
73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119446e24
0

# change skein string (zeros at the end)
$ skein256 -c 73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119440000
test.txt ; echo $?
Skein256 (test.txt) =
73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119446e24 [ Failed ]
2

### Exit code 0 with '-q' and changed skein string!
$ skein256 -q -c
73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119440000 test.txt ;
echo $?
73581ce92a851207f700d87efdaad6428554d0699bf43b187c67782119446e24
0

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