Fix LLM parameter computation error in normal softmax

[zhaixuejun1993]

This pull request makes a targeted adjustment to the logic that determines when to set input_len in the GgmlOvDecoder::compute_llm_params function. The change ensures that the input_len is only set for GGML_OP_SOFT_MAX nodes if their second source (src[1]) is not nullptr, adding an extra condition to prevent potential null pointer issues.

• Logic refinement:
  • Updated the condition in GgmlOvDecoder::compute_llm_params so that input_len is set for GGML_OP_SOFT_MAX nodes only when node->src[1] is not nullptr, improving safety and correctness.…ention

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