nbd/server: nbd_negotiate: return 1 on NBD_OPT_ABORT
Separate the case when a client sends NBD_OPT_ABORT from all other
errors. It will be needed for the following patch, where errors will be
reported.
This particular case is not actually an error - it honestly follows the
NBD protocol. Therefore it should not be reported like an error.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <
20170707152918.23086-2-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>