Frees all associated memory allocated by LPDFCompressor::Init function.
For each call to LPDFCompressor::Init there must be a call to LPDFCompressor::Free. This function should be the last function to be called when using the PDF compressor.
If this function is called before calling LPDFCompressor::Write, then the PDF document file in the memory will be destroyed and the user will lose the data in that document.
For an example, refer to LPDFCompressor::InsertNormal.