Ruby

udpsocket.c: check once first

• ext/socket/udpsocket.c (udp_connect, udp_bind): check if the
  socket is opened once before retreiving address infos.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e