xen: xenbus: Catch closing of non existent transactions
Users of the xenbus functions should never close a non existent transaction (for example by trying to closing the same transaction twice) but better catch it in xs_request_exit() than to corrupt the reference counter. Signed-off-by:Simon Gaiser <simon@invisiblethingslab.com> Reviewed-by:
Juergen Gross <jgross@suse.com> Signed-off-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com>
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2a22ee6c
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