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merge revision(s) 60162: [Backport #13994]

    socket.c: null byte at Socket.getnameinfo

    * ext/socket/socket.c (sock_s_getnameinfo): check null byte.
      patched by tommy (Masahiro Tomita) in [ruby-dev:50286].
      [Bug #13994]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62904 b2dd03c8-39d4-4d8f-98ff-823fe69b080e