Do not return unlocked/unreferenced lle in arpresolve/nd6_storelladdr -
  return lle flags IFF needed.
Do not pass rte to arpresolve - pass is_gateway flag instead.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275196 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Fix build broken by r275195.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275197 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f