[POOL-419] Fix for POOL-419. Before adding the returned object to the…

… pool, we must check whether it is already deallocated.

src/test/java/org/apache/commons/pool3/impl/TestGenericObjectPool.java

@@ -3163,7 +3163,6 @@ public Object create() {
 
             @Override
             public PooledObject<Object> wrap(final Object obj) {
-                // fake
                 return new DefaultPooledObject<>(obj);
             }
         };