Close the client socket at the end of each benchmark run

git-svn-id: http://svn.codehaus.org/jruby/trunk/jruby@7785 961051c9-f516-0410-bf72-c9f7e237a7b7

bench/bench_io_tcpserver.rb

@@ -25,6 +25,7 @@
         iter.times { sock.write buf }
         sock.close_write
         sock.read(1)
+        sock.close
       end
     end
   end