Merge pull request #3422 from arunagw/unused_var_warning

Unused variable removed

activesupport/test/buffered_logger_test.rb

@@ -233,7 +233,7 @@ def test_flush_dead_buffers
     end
     
     keep_running = true
-    b = Thread.new do
+    Thread.new do
       @logger.info("b")
       while keep_running
         sleep(0.001)