Correct the calculation of tcps_rto in the struct tcpcb -> tcpsinfo_t
translator.

Submitted by:	Grenville Armitage <garmitage@swin.edu.au>
MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273370 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f