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由 Luiz Capitulino 提交于
The call to drv->bdrv_reopen_prepare() can fail due to reasons other than an open failure. Unfortunately, we can't use errno nor -ret, cause they are not always set. Stick to a generic error message then. Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Acked-by: NKevin Wolf <kwolf@redhat.com>
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