fix second argument of MEMZERO

* ext/socket/raddrinfo.c (rb_getaddrinfo): second argument of
  MEMZERO is type.  Coverity Scan found this bug.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45087 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-02-22

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e