OSV-2026-928 Stack-use-after-scope in StreamReader_CApi::wait_for_file_size

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=524393006 Crash type: Stack-use-after-scope READ 8 Crash state: StreamReaderCApi::waitforfilesize Boxiloc::readdata HeifFile::appenddatafromiloc...