msdk: don't cache mfxFrameAllocResponse pointer
Otherwise it is possible that different wrappers share the same mfxFrameAllocResponse pointer, so instead of caching the pointer, we may cache the content of mfxFrameAllocResponse
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Otherwise it is possible that different wrappers share the same mfxFrameAllocResponse pointer, so instead of caching the pointer, we may cache the content of mfxFrameAllocResponse