kern/27660: Kernel does not return error if adding duplicate address

[maxim at FreeBSD.org]

Synopsis: Kernel does not return error if adding duplicate address

State-Changed-From-To: open->closed
State-Changed-By: maxim
State-Changed-When: Fri Jul 29 11:01:37 UTC 2011
State-Changed-Why: 
It doesn't look like a bug for me.  Let me know if you
want to keep this PR open.

http://www.freebsd.org/cgi/query-pr.cgi?pr=27660