MKL optimized elementwise add backward: coding style fixes

paddle/fluid/operators/elementwise_add_op.cc

@@ -26,5 +26,5 @@ REGISTER_OP_CPU_KERNEL(
     elementwise_add_grad,
     ops::ElementwiseAddGradKernel<paddle::platform::CPUDeviceContext, float>,
     ops::ElementwiseAddGradKernel<paddle::platform::CPUDeviceContext, double>);
-//    ops::ElementwiseAddGradKernel<paddle::platform::CPUDeviceContext, int>,
-//    ops::ElementwiseAddGradKernel<paddle::platform::CPUDeviceContext, int64_t>);
+// ops::ElementwiseAddGradKernel<paddle::platform::CPUDeviceContext, int>,
+// ops::ElementwiseAddGradKernel<paddle::platform::CPUDeviceContext, int64_t>);

paddle/fluid/operators/elementwise_add_op.h

@@ -102,7 +102,7 @@ class ElementwiseAddGradKernel : public framework::OpKernel<T> {
     if (platform::is_cpu_place(ctx.GetPlace()) && (x->dims() == y->dims())) {
       auto blas = math::GetBlas<DeviceContext, T>(ctx);
 
-      if (dx) 
+      if (dx)
         dx->mutable_data<T>(ctx.GetPlace());
       if (dy)
         dy->mutable_data<T>(ctx.GetPlace());