sheepdog: fix return value of do_load_save_vm_state
bdrv_save_vmstate and bdrv_load_vmstate should return the vmstate size on success, and -errno on error. Signed-off-by: NMORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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