* ext/fiddle/closure.c (initialize): check mprotect's return value.
  If mprotect is failed because of PaX or something, its function call
  will cause SEGV.
  http://c5664.rubyci.org/~chkbuild/ruby-trunk/log/20130401T210301Z.diff.html.gz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40216 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-04-11

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40217 b2dd03c8-39d4-4d8f-98ff-823fe69b080e