Update test to grpc_call_invoke

test/core/end2end/tests/thread_stress.c

@@ -116,8 +116,8 @@ static void start_request() {
   gpr_slice_unref(slice);
 
   g_active_requests++;
-  GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_invoke(call, g_fixture.client_cq,
-                                                    NULL, NULL, NULL, 0));
+  GPR_ASSERT(GRPC_CALL_OK == grpc_call_invoke(call, g_fixture.client_cq,
+                                                    NULL, NULL, 0));
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_read(call, NULL));
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_write(call, buf, NULL, 0));