ROB: Avoid negative seek values when reading partially broken files (… #6092

Job	Run time
Check code style issues	35s
Build & verify package	13s
pytest on 3.8 (crypto-lib: cryptography)	5m 40s
pytest on windows	6m 7s
pytest on 3.9 (crypto-lib: cryptography)	5m 44s
pytest on 3.10 (crypto-lib: cryptography)	5m 33s
pytest on 3.11 (crypto-lib: cryptography)	5m 1s
pytest on 3.12 (crypto-lib: cryptography)	7m 18s
pytest on 3.13 (crypto-lib: cryptography)	6m 46s
pytest on 3.8 (crypto-lib: pycryptodome)	5m 52s
pytest on 3.8 (crypto-lib: none)	6m 0s
Combine & check coverage.	12s
	55m 1s

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