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kzonecheck should be able to read from stdin

running knot 2.5.4-2 on debian, i can't get kzonecheck to read from stdin:

0 dkg@alice:~$ printf '@ 1D SOA a.ns hostmaster 2017092400 1d 1d 1d 1d\n' | kzonecheck -o example.com /dev/stdin
Failed to load the zone file.
1 dkg@alice:~$

even worse, there's a segfault:

0 dkg@alice:~$ kzonecheck -o foo.example /dev/stdin <<<'@ 1D SOA a.ns hostmaster 2017092400 1d 1d 1d 1d\n'
Segmentation fault
139 dkg@alice:~$

it'd be great to have - mean "stdin" and to have kzonecheck be able to cope with it cleanly.