* ext/socket/raddrinfo (rsock_unix_sockaddr_len): renamed from
  rsock_unixpath_len, because it returns not the length of the path,
  but the length of a socket address for the path.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38943 b2dd03c8-39d4-4d8f-98ff-823fe69b080e