Patch: Account for possible null laddr in Socket.java

[Mohan Embar]

HI Michael,

>I have written a new patch for this. Please review and comment.

This looks nice. I especially like how you've cleaned things up
and are explicitly testing for things. Everything I saw seemed
in conformance with the JavaDoc, and I tested the Socket
constructor on the JRE and it threw a NullPointerException
just like you coded.

-- Mohan
http://www.thisiscool.com/
http://www.animalsong.org/