[fetch] Fix double free in fetch_free() with streaming fetch requests #25856
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fetch->data will be allocated and freed in onprogress if fetch attribute EMSCRIPTEN_FETCH_STREAM_DATA is used, however it will still be freed in fetch_free() causing double free problem.
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fetch->data will be allocated and freed in onprogress if fetch attribute EMSCRIPTEN_FETCH_STREAM_DATA is used, however it will still be freed in fetch_free() causing double free problem.