[Bug 198437] Fix net/ladvd build with clang 3.6.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198437

            Bug ID: 198437
           Summary: Fix net/ladvd build with clang 3.6.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: sten at blinkenlights.nl
             Flags: maintainer-feedback?(sten at blinkenlights.nl)
                CC: sten at blinkenlights.nl

Created attachment 154040
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154040&action=edit
Remove unnecessary null checks

During the exp-run in bug 197395, it was found that net/ladvd gives errors with
clang 3.6.0:

http://package18.nyi.freebsd.org/data/headamd64PR197395-default/2015-02-11_23h04m51s/logs/errors/ladvd-1.0.4_1.log

This error is because ladvd defines a few functions using
__attribute__((nonnull)), then proceeds to check the parameters for being NULL
anyway.  This is silly, so remove the checks.

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