raddrinfo.c: suppress warnings

* ext/socket/raddrinfo.c (rsock_inspect_sockaddr): cast down
  explicitly to suppress warnings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-05-12

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40649 b2dd03c8-39d4-4d8f-98ff-823fe69b080e