Merge pull request rails#5465 from sandeepravi/warning_fixes

fixed - warning: assigned but unused variable - checker

Author: josevalim

activesupport/test/file_update_checker_test.rb

@@ -86,7 +86,7 @@ def test_should_not_block_if_a_strange_filename_used
     FileUtils.touch(FILES.map { |file_name| "tmp_watcher/valid,yetstrange,path,/#{file_name}" } )
 
     test = Thread.new do
-      checker = ActiveSupport::FileUpdateChecker.new([],"tmp_watcher/valid,yetstrange,path," => :txt){ i += 1 }
+      ActiveSupport::FileUpdateChecker.new([],"tmp_watcher/valid,yetstrange,path," => :txt){ i += 1 }
       Thread.exit
     end
     test.priority = -1