xen: xenbus_dev_frontend: Really return response string
xenbus_command_reply() did not actually copy the response string and leaked stack content instead. Fixes: 9a6161fe ("xen: return xenstore command failures via response instead of rc") Signed-off-by: NSimon Gaiser <simon@invisiblethingslab.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
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