sample/timeout.rb: Remove unnecessary increment [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62898 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sample/timeout.rb

@@ -1,7 +1,7 @@
 require 'timeout'
 
 def progress(n = 5)
-  n.times {|i| print i; STDOUT.flush; sleep 1; i+= 1}
+  n.times {|i| print i; STDOUT.flush; sleep 1}
   puts "never reach"
 end