check return code of prepare_revision_walk
A failure in prepare_revision_walk can be caused by a not parseable object. Signed-off-by: Martin Koegler <mkoegler@auto.tuwien.ac.at> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano

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@ -2033,7 +2033,8 @@ static void get_object_list(int ac, const char **av)
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die("bad revision '%s'", line);
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}
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prepare_revision_walk(&revs);
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if (prepare_revision_walk(&revs))
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die("revision walk setup failed");
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mark_edges_uninteresting(revs.commits, &revs, show_edge);
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traverse_commit_list(&revs, show_commit, show_object);
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