fix handling of files of unsupported type in the walk code if a file was of unsupported type, it was considered as 'seen' while walking. this way it was possible to have file in the dirstate not yielded by the walk function.

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#!/bin/sh

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hg

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hg -q

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hg help

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hg -q help

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hg add -h

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hg add --skjdfks

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hg help diff

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hg help status

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hg -q help status

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hg help foo

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hg skjdfks

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exit 0