This patch fixes the redundant descriptor move in the copy mode
of vhost crypto. Originally the redundant descriptor move will
cause the message parsing error.
Fixes: 3bb595ecd682 ("vhost/crypto: add request handler")
Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>