UCX osc: make MPI_Fetch_and_op non-blocking if possible

Signed-off-by: Joseph Schuchart <schuchart@hlrs.de>

ompi/mca/osc/ucx/osc_ucx_comm.c

@@ -816,8 +816,9 @@ int ompi_osc_ucx_fetch_and_op(const void *origin_addr, void *result_addr,
             }
         }
 
-        ret = opal_common_ucx_wpmem_fetch(module->mem, opcode, value, target,
-                                        (void *)result_addr, dt_bytes, remote_addr);
+        ret = opal_common_ucx_wpmem_fetch_nb(module->mem, opcode, value, target,
+                                             (void *)result_addr, dt_bytes,
+                                             remote_addr, NULL, NULL);
 
         if (module->acc_single_intrinsic) {
             return ret;