SUNRPC: rpc_call_null_helper() should set RPC_TASK_SOFT

Clean up.

All of rpc_call_null_helper() call sites assert RPC_TASK_SOFT, so
move that setting into rpc_call_null_helper() itself.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/auth_gss/auth_gss.c

@@ -1288,7 +1288,7 @@ gss_send_destroy_context(struct rpc_cred *cred)
 
 		trace_rpcgss_ctx_destroy(gss_cred);
 		task = rpc_call_null(gss_auth->client, &new->gc_base,
-				RPC_TASK_ASYNC|RPC_TASK_SOFT);
+				     RPC_TASK_ASYNC);
 		if (!IS_ERR(task))
 			rpc_put_task(task);
 

net/sunrpc/clnt.c

@@ -2752,7 +2752,7 @@ struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
 		.rpc_op_cred = cred,
 		.callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
 		.callback_data = data,
-		.flags = flags | RPC_TASK_NULLCREDS,
+		.flags = flags | RPC_TASK_SOFT | RPC_TASK_NULLCREDS,
 	};
 
 	return rpc_run_task(&task_setup_data);
@@ -2816,7 +2816,7 @@ int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
 	}
 
 	task = rpc_call_null_helper(clnt, xprt, NULL,
-			RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC,
+			RPC_TASK_SOFTCONN|RPC_TASK_ASYNC,
 			&rpc_cb_add_xprt_call_ops, data);
 
 	rpc_put_task(task);
@@ -2859,8 +2859,7 @@ int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
 		goto out_err;
 
 	/* Test the connection */
-	task = rpc_call_null_helper(clnt, xprt, NULL,
-				    RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
+	task = rpc_call_null_helper(clnt, xprt, NULL, RPC_TASK_SOFTCONN,
 				    NULL, NULL);
 	if (IS_ERR(task)) {
 		status = PTR_ERR(task);