Fix cos/sin double_grad functor error when meets null ptr

[HydrogenSulfate]

PR Category

Operator Mechanism

PR Types

Bug fixes

Description

Pcard-75624

修复 Sin/Cos Double Grad functor 中为判空直接获取输出指针的行为，将其移动到了判断分支的内部，避免出现类似如下的报错

RuntimeError: (NotFound) Unable to get phi::DenseTensor data of Output d2x in operator SinDoubleGrad. Possible reasons are:
  1. The d2x is not the Output of operator SinDoubleGrad;
  2. The d2x has no corresponding variable passed in;
  3. The d2x corresponding variable is not initialized.
  [Hint: pointer dX should not be null.] (at ../paddle/phi/kernels/funcs/activation_functor.h:178)

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