Fix for minor memory leak in fmap_dump_to_file().
Fix to PDF object stream logic, accounting for a realloc() issue when the only pdf object stream fails to parse, and for when pdf objects in a stream appear to extend further than the size of the stream.
Fix for memory leak cleaning up PDF object stream buffer in error condition.
Fix to bug in pdf_decodestream wherein objects were found in an object stream, but the object stream could later be free'd if max scansize was exceeded, resulting in a NULL dereference.
General cleanup of pdf_decodestream/pdf_decodestream_internal exit code logic.
