knot_pkt_begin: fix beginning the same section again
The .pos value might get wrong (though I see no usage ATM). Notes: - It still returns KNOT_EOK in case of equality; that's due to usage in resolver and requirement to special-case KNOT_ANSWER anyway. - I would personally assert(false) on all internal failures (e.g. EINVAL), as immediate abortion seems preferrable when in debug mode, but the code around typically doesn't do that, so I left it without assertions.
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