cleanup by @vipulnsward [GH fixes #262]

lib/net/http/generic_request.rb: Removes unnecessary assignment
lib/net/ftp.rb: Fixes dead code


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39876 b2dd03c8-39d4-4d8f-98ff-823fe69b080e