This patch fixes a out of bound access possbility in vhost
crypto. Originally the incorrect next descriptor index may
cause the library read invalid memory content and crash
the application.
Fixes: 3bb595ecd682 ("vhost/crypto: add request handler")
Cc: stable@dpdk.org
Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>