piix: fix resource leak reported by Coverity
config_fd should be closed before return, or there will be a resource leak error. Signed-off-by:zhanghailiang <zhang.zhanghailiang@huawei.com> Reviewed-by:
Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> Reviewed-by:
Stefan Hajnoczi <stefanha@redhat.com>
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