block: Fix error path in bdrv_backing_update_filename()
error_setg_errno() takes a positive errno code. Spotted by Coverity (CID 1381628). Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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