6543 Fix memory leak in uu_avl_pool_destroy

@@ -126,10 +126,11 @@
         }
         (void) pthread_mutex_lock(&uu_apool_list_lock);
         pp->uap_next->uap_prev = pp->uap_prev;
         pp->uap_prev->uap_next = pp->uap_next;
         (void) pthread_mutex_unlock(&uu_apool_list_lock);
+        (void) pthread_mutex_destroy(&pp->uap_lock);
         pp->uap_prev = NULL;
         pp->uap_next = NULL;
         uu_free(pp);
 }