Exercise input validation code paths in
block/export/vhost-user-blk-server.c.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20210309094106.196911-5-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210322092327.150720-4-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>