Remove an initialized, but otherwise, unused variable.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271147 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
use a straight buffer instead of an iov w/ 1 segment...  The aesni
driver when it hits a mbuf/iov buffer, it mallocs and copies the data
for processing..  This improves perf by ~8-10% on my machine...

I have thoughts of fixing AES-NI so that it can better handle segmented
buffers, which should help improve IPSEC performance, but that is for
the future...


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271148 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f