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Fix memory leak in H5LTopen_file_image when H5LT_FILE_IMAGE_DONT_COPY…
… flag is used (HDFGroup#4021) When the H5LT_FILE_IMAGE_DONT_COPY flag is passed to H5LTopen_file_image, the internally-allocated udata structure gets leaked as the core file driver doesn't have a way to determine when or if it needs to call the 'udata_free' callback. This has been fixed by freeing the udata structure when the 'image_free' callback gets made during file close, where the file is holding the last reference to the udata structure.
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