* lib/drb/drb.rb (DRbConn::alive?): fixed NoMethodError problem
	  from NaHi [ruby-dev:37110].


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@22343 b2dd03c8-39d4-4d8f-98ff-823fe69b080e