If write lock is not held do not change the counter

lead to inconsistent lock state

Author: pitr-ch

lib/concurrent/atomic/read_write_lock.rb

@@ -193,7 +193,8 @@ def acquire_write_lock
     #
     # @return [Boolean] true if the lock is successfully released
     def release_write_lock
-      c = @Counter.update { |counter| counter-RUNNING_WRITER }
+      return true unless running_writer?
+      c = @Counter.update { |counter| counter - RUNNING_WRITER }
       @ReadLock.broadcast
       @WriteLock.signal if waiting_writers(c) > 0
       true