merge revision(s) 53231,53244: [Backport #11854]
* ext/socket/init.c (rsock_init_sock): check FD after validating * test/socket/test_basicsocket.rb (test_for_fd): new [ruby-core:72418] [Bug #11854]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@53923 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 53231,53244: [Backport #11854]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@53923 b2dd03c8-39d4-4d8f-98ff-823fe69b080e