Remove ruby warning
Remove ruby warning

    require 'nio'
    selector = NIO::Selector.new
    socket = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
    selector.register(socket, :w) # !> instance variable lock_holder not initialized

tpetchel/nio4r,celluloid/nio4r,marshall-lee/nio4r,celluloid/nio4r,celluloid/nio4r,tpetchel/nio4r,marshall-lee/nio4r,marshall-lee/nio4r,tpetchel/nio4r