Revert "net: fix crash in tcp_nuke_addr()"

This reverts commit 3ac97f24.

Now that SOCK_DESTROY is in place, lets revert SIOCKILLADDR patches.

Change-Id: Ide5fb3da059a01b7091621d6936b12e9f42042e1
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>