merge revision(s) r46182: [Backport #9872]

	* lib/net/ftp.rb (transfercmd): Close TCP server socket even if an
	  exception occur.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e