Avoid comma in macro

test=develop

paddle/fluid/operators/lrn_mkldnn_op.cc

@@ -50,8 +50,8 @@ template <typename T>
 class LRNMKLDNNOpKernel : public paddle::framework::OpKernel<T> {
  public:
   void Compute(const paddle::framework::ExecutionContext& ctx) const override {
-    PADDLE_ENFORCE(std::is_same<typename T, float>::value,
-                   "MKLDNN LRN must use float data.");
+    bool is_float_type = std::is_same<T, float>::value;
+    PADDLE_ENFORCE(is_float_type, "MKLDNN LRN must use float data.");
     PADDLE_ENFORCE(paddle::platform::is_cpu_place(ctx.GetPlace()),
                    "MKLDNN LRN must use CPUPlace.");