dump/win_dump: fix use after free of err
It's possible that we'll try to set err twice (or more). It's bad, it will crash. Instead, use warn_report(). Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20200324153630.11882-4-vsementsov@virtuozzo.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
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