JariBakken: Fix wrong ivar usage in SocketLock.
JariBakken: Fix wrong ivar usage in SocketLock.

This passed the tests since nil is a valid argument for TCPServer.new,
defaulting to 0.0.0.0.

git-svn-id: aa1aa1384423cb28c2b1e29129bb3a91de1d9196@9900 07704840-8298-11de-bf8c-fd130f914ac9

jmt4/Selenium2,jmt4/Selenium2,yumingjuan/selenium,yumingjuan/selenium,jmt4/Selenium2,yumingjuan/selenium,jmt4/Selenium2,yumingjuan/selenium,jmt4/Selenium2,jmt4/Selenium2,yumingjuan/selenium,yumingjuan/selenium,yumingjuan/selenium,yumingjuan/selenium,jmt4/Selenium2,jmt4/Selenium2,jmt4/Selenium2,yumingjuan/selenium