cxgbe/tom:  Catch up with r271119, syncache_add doesn't need tcbinfo lock.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272079 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Update comment (missed this bit in r272079).


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272080 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Catch up with r271119.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272081 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f