Fix ptr type

paddle/operators/clip_op.h

@@ -83,7 +83,7 @@ class ClipGradKernel : public framework::OpKernel {
     if (d_x != nullptr) {
       auto* x = context.Input<Tensor>("X");
       int64_t numel = d_out->numel();
-      auto d_x_data = d_x->mutable_data<T>(context.GetPlace());
+      auto* d_x_data = d_x->mutable_data<T>(context.GetPlace());
       const T* d_out_data = d_out->data<T>();
       const T* x_data = x->data<T>();
       Transform<Place> trans;