PML/UCX/WPOOL: fixe potential leak in error processing

- there was potential leak in error handling, fixed

Signed-off-by: Sergey Oblomov <sergeyo@nvidia.com>

opal/mca/common/ucx/common_ucx_wpool.c

@@ -219,6 +219,8 @@ err_get_addr:
     OBJ_RELEASE(wpool->dflt_winfo);
     wpool->dflt_winfo = NULL;
  err_worker_create:
+    OBJ_DESTRUCT(&wpool->idle_workers);
+    OBJ_DESTRUCT(&wpool->active_workers);
     ucp_cleanup(wpool->ucp_ctx);
  err_ucp_init:
     return rc;